9 Best Open Source Firewall Distributions in 2026

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The best open source firewall distributions in 2026 are OPNsense for most full-appliance deployments, pfSense Community Edition for maturity, OpenWrt for supported embedded routers, IPFire for a Linux-based appliance, and VyOS for CLI-driven routing. OpenBSD, Shorewall, NethSecurity, and Endian are specialist choices rather than equivalent alternatives.

“Best” depends on whether you need a graphical appliance, embedded router firmware, an automation-friendly network operating system, or a firewall framework layered onto Linux. This list includes all four categories because the market commonly groups them together, but the differences affect installation, maintenance, licensing, hardware, and recovery.

Key takeaways

• OPNsense is the best default choice for many home, homelab, and small-business networks that need a modern graphical firewall appliance.
• pfSense Community Edition is a mature FreeBSD-based alternative, but pfSense CE, pfSense Plus, Netgate appliances, commercial packages, and support do not all share one identical license.
• OpenWrt is the best choice for supported embedded routers, while VyOS is better suited to CLI-managed routing, virtual machines, cloud deployments, and automation.
• IPFire provides an approachable Linux firewall appliance with zones, VPN, QoS, DNS, add-ons, and optional intrusion prevention.
• OpenBSD is a minimal Unix firewall platform and Shorewall is a Linux firewall configuration framework, so neither should be compared as a conventional point-and-click appliance.
• NethSecurity and Endian require current verification because their release maturity, community-edition status, licensing, and commercial positioning need closer inspection.

What are the best open source firewall distributions?

The best open source firewall distributions are OPNsense, pfSense Community Edition, OpenWrt, IPFire, VyOS, OpenBSD, NethSecurity, Shorewall, and Endian, but the nine projects do not represent the same type of software. OPNsense and pfSense CE are dedicated firewall appliances; OpenWrt is embedded router firmware; VyOS is a network operating system; OpenBSD is a general Unix platform commonly used with pf; and Shorewall is a Linux firewall configuration tool.

For most readers, OPNsense is the best overall recommendation. OPNsense offers a web interface, routing, NAT, VLANs, VPNs, plugins, high availability, and x86-64 deployment on generic hardware. Readers who already know pfSense may prefer pfSense CE, while users installing software on a supported consumer router should choose OpenWrt instead.

Quick comparison of the nine platforms

Platform	Best for	Base or architecture	Product type	Management	Open-source qualification
OPNsense	General-purpose appliance	FreeBSD, primarily x86-64	Firewall and router distribution	Web GUI and CLI	Open-source project with commercial hardware and support options
pfSense CE	Mature firewall deployments	FreeBSD, principally amd64	Firewall and router distribution	Web GUI and CLI	Free CE with a mixed licensing ecosystem and separate commercial offerings
OpenWrt	Embedded routers and low-power devices	Linux, many device-specific architectures	Router firmware and embedded operating system	Web GUI, SSH, and CLI tools	Open-source project; exact support depends on the device and hardware revision
IPFire	Linux-based home and small-office gateways	Linux	Firewall distribution	Web GUI and shell	Open-source firewall project with add-ons and support options
VyOS	CLI routing and automation	Linux	Network operating system	Configuration-driven CLI and automation	Community and commercial image/support distinctions require current checking
OpenBSD	Minimal Unix firewalls	OpenBSD	Operating system with pf	CLI and configuration files	Open-source operating system; not a dedicated appliance GUI
NethSecurity	Emerging web-managed Linux gateways	Linux/OpenWrt-oriented	Gateway appliance project	Web management	Verify current release maturity, components, and support policy
Shorewall	Version-controlled Linux firewall policy	GNU/Linux	Firewall configuration framework	Configuration files and command line	GPL-licensed framework, not a complete appliance distribution
Endian	Commercial and industrial security evaluation	Vendor platform	Commercial/open-source hybrid or specialist gateway	Vendor management tools	Confirm the current downloadable community edition and licensing before choosing it

How were these firewall distributions ranked?

The ranking considers current project visibility, documentation, core firewall and routing capability, VPN and IPv6 support, hardware and deployment flexibility, backup and recovery practicality, licensing clarity, and suitability for the audiences that commonly self-host a perimeter firewall. The ranking does not claim that one project has universally higher throughput or security.

Performance comparisons are only meaningful when the hardware, network interfaces, packet sizes, NAT and VLAN rules, VPN settings, IDS/IPS state, and test method are identical. A small appliance that handles basic NAT may struggle after encryption, deep inspection, traffic analysis, proxying, and extensive logging are enabled.

1. OPNsense: best overall open source firewall distribution

OPNsense is the best overall choice for readers who want a full-featured open source firewall appliance with a modern web interface. OPNsense is a FreeBSD-based firewall and routing platform supporting VLANs, routing, NAT, VPNs, plugins, DNS-related services, traffic management, and high availability.

OPNsense supports x86-64 installations on generic hardware and can use SSDs, hard disks, or SD media, according to the project’s official hardware guidance. The correct hardware depends on NIC quality, storage reliability, RAM, VPN encryption, traffic volume, and whether IDS/IPS or other inspection services are enabled.

Why choose OPNsense?

• The web interface is approachable for home users while still exposing advanced routing and security controls.
• VLANs, multi-WAN, VPNs, NAT, DNS, traffic shaping, plugins, and high availability support common homelab and SMB designs.
• Generic x86-64 deployment avoids locking the installation to one router model.
• Commercial appliances and support are available through Deciso and partners, although buying an appliance is optional.

What are OPNsense’s drawbacks?

OPNsense needs a dedicated appliance or virtual machine and is more demanding than embedded router firmware. Hardware driver quality remains important, particularly for multi-gigabit networking. Plugins can expand functionality but also increase update, compatibility, and troubleshooting complexity.

Choose OPNsense if you want the safest general-purpose recommendation, a graphical administration model, and room to grow into VLANs, VPNs, multi-WAN, and inspection services. Start with the project’s OPNsense installation and getting-started information.

2. pfSense Community Edition: best mature alternative

pfSense Community Edition is a strong choice for administrators who value maturity, extensive historical documentation, and familiarity with the pfSense ecosystem. pfSense CE is a FreeBSD-based firewall and router distribution managed through a web interface, with routing, NAT, VLANs, VPNs, captive portal, packages, and virtual or bare-metal deployment options.

The official pfSense introduction describes Community Edition as a free, open-source customized FreeBSD distribution for firewall and router use. Typical self-built installations use amd64, and hardware compatibility follows relevant FreeBSD support; readers should consult the project’s hardware-selection guidance for the version and hardware being deployed.

What should readers know about pfSense licensing?

Readers should not describe the entire pfSense ecosystem as having one simple license. The official pfSense licensing documentation lists multiple licenses across components, including BSD, Apache, GPL, LGPL, MPL, and some EULAs. pfSense CE, pfSense Plus, Netgate appliances, packages, support, and subscriptions must therefore be considered separately.

pfSense CE is especially attractive when an organization already has pfSense knowledge or needs compatibility with existing procedures. Users should verify the current Community Edition download, release policy, package availability, and licensing before installation rather than relying on an old comparison article.

3. OpenWrt: best for embedded routers

OpenWrt is the best open source firewall distribution for a supported embedded router, access point, bridge, or low-power gateway. OpenWrt is not simply a smaller version of OPNsense or pfSense; OpenWrt is an embedded Linux operating system with a package ecosystem designed for device-specific networking hardware.

OpenWrt supports fine-grained firewalling, DNS, routing, VLANs, wireless configuration, mesh networking, and packages. The central decision is hardware compatibility. Check the exact model and hardware revision in the project’s Table of Hardware before flashing anything.

Why is OpenWrt harder to recommend by model?

OpenWrt installation and recovery vary by manufacturer, bootloader, flash layout, switch chip, wireless chipset, and hardware revision. A device that looks like a supported model may require a different image or have different resources after a hardware revision. Readers must also check RAM, flash capacity, recovery procedures, VLAN support, and whether the device can handle VPN encryption or inspection workloads.

Because current OpenWrt release and device instructions require manual verification at publication time, this article intentionally avoids universal minimum hardware figures, exact release numbers, and device-specific flashing commands. Use the project’s official installation documentation and the target device page.

Choose OpenWrt when low power, integrated wireless, small size, or an existing supported router matters more than an appliance-style interface. Disconnect the WAN, preserve the vendor recovery path, and never flash an image without confirming the exact device revision.

4. IPFire: best approachable Linux firewall appliance

IPFire is a credible Linux-based firewall distribution for home and small-office gateways that need a web interface, zones, VPNs, QoS, DNS, and optional add-ons. IPFire’s documentation covers firewall configuration, zones, intrusion prevention, DNS, QoS, VPNs, add-ons, and hardware.

IPFire’s zone model helps administrators separate network roles rather than treating every interface as equivalent. IPsec, WireGuard, and OpenVPN are documented options, while intrusion prevention and other capabilities may require configuration, add-ons, and hardware sized for the workload.

What are IPFire’s limitations?

IPFire has a smaller ecosystem and community footprint than OPNsense or pfSense. Feature availability, architecture support, and performance vary with hardware and enabled services, so readers should check the project’s official hardware documentation before using ARM or unusual hardware.

IPFire suits readers who prefer Linux and want a purpose-built appliance instead of manually assembling DHCP, DNS, VPN, firewall, and routing services on a general-purpose distribution.

5. VyOS: best for CLI routing and automation

VyOS is the best choice for CLI-first routing, infrastructure automation, virtual routers, cloud networking, and advanced lab deployments. VyOS is a Linux-based network operating system with configuration-driven IPv4 and IPv6 firewalling, NAT, firewall groups, zones, bridge filtering, and routing features.

The VyOS firewall documentation shows structured commands such as set firewall ipv4, set firewall ipv6, set firewall zone, firewall groups, NAT, and bridge filtering. This model is powerful for repeatable configuration and automation but less suitable for a home user who expects every task to be performed in a GUI.

What VyOS boot issue should administrators test?

VyOS documentation warns about a boot-time race condition in which interfaces can initialize before the firewall, temporarily exposing traffic before firewall rules are active. Administrators should physically isolate WAN access during installation, validate behavior after every reboot and upgrade, and include boot-order testing in the security acceptance checklist.

VyOS is a natural candidate for virtual machines and cloud instances, but current image availability, commercial/community distinctions, and support terms must be checked before deployment. The official VyOS documentation is the appropriate starting point.

6. OpenBSD with pf: best for minimal Unix control

OpenBSD is the best specialist platform for Unix administrators who want a minimal operating system and direct control of the pf firewall. OpenBSD is not a dedicated appliance distribution with a conventional firewall dashboard; OpenBSD is a general operating system that can provide firewall, router, bastion, and gateway services.

OpenBSD’s pf documentation covers the packet filter and its configuration model. The platform rewards administrators who understand interfaces, routing, stateful rules, NAT, logging, service isolation, and Unix recovery procedures.

Who should avoid OpenBSD as a first firewall?

Readers who need a beginner-friendly GUI, integrated DHCP and DNS workflows, point-and-click VPN setup, or appliance-style backups should start with OPNsense, pfSense CE, or IPFire. Minimal software does not automatically produce a safer deployment when the administrator is unfamiliar with Unix networking or pf syntax.

OpenBSD is a good choice for a carefully controlled, manually maintained gateway where configuration simplicity and direct administration matter more than an integrated appliance ecosystem. Verify current release-specific syntax and hardware guidance through the OpenBSD FAQ.

7. NethSecurity: an emerging Linux gateway candidate

NethSecurity is worth evaluating for a web-managed Linux gateway, but it should remain a conditional recommendation until current release maturity, licensing, hardware support, and update policy are verified. NethSecurity is associated with the NethServer ecosystem and presents an appliance-oriented gateway model rather than requiring administrators to assemble every networking service manually.

Before using NethSecurity in production, inspect the project’s current documentation, official project site, and source repository. Confirm the stable release, supported architectures, VPN, VLAN, multi-WAN, IDS/IPS capabilities, proprietary components, backup behavior, and support policy.

NethSecurity may be attractive to small businesses already using NethServer, but the available evidence does not justify ranking it above the established platforms without a fresh first-party verification pass.

8. Shorewall: best Linux firewall configuration framework

Shorewall is best understood as a Linux firewall configuration system, not a complete firewall appliance operating system. Shorewall turns declarative configuration files into Linux firewall policy and supports zones, NAT, routing, VPN-related configurations, logging, and QoS-related administration.

Shorewall is useful when a team already operates Linux servers and wants firewall policy that can be reviewed, version-controlled, and managed through change control. The official Shorewall site identifies Shorewall as a GNU/Linux gateway and firewall configuration tool, lists stable version 5.2.8, and describes its GPL licensing.

What does Shorewall require that an appliance does not?

Shorewall requires the administrator to select, install, harden, update, monitor, back up, and recover the underlying Linux distribution. Shorewall does not automatically provide the complete appliance lifecycle, integrated hardware validation, or dashboard experience associated with OPNsense or pfSense.

Choose Shorewall when Linux is already the platform decision and configuration-file administration is a benefit. Do not choose Shorewall solely because a list calls it a firewall distribution.

9. Endian: a conditional commercial and industrial alternative

Endian should be treated as a specialist commercial or open-source hybrid gateway, not as a straightforward free community alternative to OPNsense or OpenWrt. Endian’s current website emphasizes its Secure Digital Platform, IT/OT security gateways, centralized management, zero-trust security, industrial environments, compliance, and request-pricing workflows.

The current Endian community page does not by itself establish that a conventional, actively maintained, freely downloadable community firewall edition is equivalent to the open-source projects above. Confirm which edition is downloadable, whether it remains maintained, which features are commercial, what licensing applies, and whether current updates and documentation are available.

Endian belongs on a broad comparison only because readers evaluating firewall platforms may encounter the brand. Organizations needing vendor-backed industrial or business security should evaluate Endian on support, lifecycle, management, and commercial requirements—not assume that Endian offers the same self-hosting model as OPNsense, OpenWrt, or IPFire.

Which firewall distribution is best for each use case?

Requirement	Best starting point	Why	Important qualification
Full-featured GUI appliance	OPNsense	Strong combination of GUI administration, routing, VLANs, VPNs, plugins, and high availability	Use compatible x86-64 hardware and size for inspection and VPN workloads
Mature documentation and existing pfSense expertise	pfSense CE	Long-established platform and broad operational familiarity	Separate CE, Plus, Netgate hardware, packages, and licensing
Supported consumer router	OpenWrt	Lightweight embedded Linux with extensive router and wireless control	Verify exact model, revision, image, flash, RAM, and recovery method
Linux appliance	IPFire	Purpose-built distribution with zones, VPN, QoS, DNS, web administration, and add-ons	Check hardware and architecture support for the intended services
CLI routing and automation	VyOS	Configuration-driven routing and firewalling suited to labs, VMs, cloud, and infrastructure-as-code	Validate image availability, support terms, and boot-time firewall behavior
Minimal Unix gateway	OpenBSD	Direct control of pf on a deliberately minimal operating system	Requires strong Unix and networking administration skills
Version-controlled Linux policy	Shorewall	Declarative firewall configuration layered onto Linux	Not a self-contained appliance operating system
Emerging small-business gateway	NethSecurity	Web-managed Linux/OpenWrt-oriented approach	Verify production maturity, licensing, and current feature support
Industrial or vendor-backed security	Endian	Commercial IT/OT security and centralized-management emphasis	Do not treat it as a verified free community distribution without edition evidence

What hardware does an open source firewall need?

An open source firewall needs hardware matched to the network interfaces, throughput, VPN encryption, inspection services, storage, and recovery requirements. There is no universal CPU or RAM minimum that predicts performance across all nine platforms.

Bare-metal firewall hardware

• Use reliable, well-supported NICs and confirm driver behavior for the chosen operating system.
• Use at least two physical network interfaces for a conventional WAN and LAN design.
• Use VLAN-capable switching when multiple trusted, guest, IoT, or lab networks share physical infrastructure.
• Use reliable SSD or industrial flash where logging and frequent writes make endurance important.
• Size CPU and memory for VPN encryption, IDS/IPS, proxying, traffic analysis, logging, and multi-gigabit traffic rather than basic NAT alone.
• Keep a replacement boot device or documented reinstallation path available.

OPNsense’s hardware documentation emphasizes architecture and hardware selection, and pfSense provides separate hardware documentation. Both reinforce the need to choose hardware for the workload rather than assuming that any multi-port mini-PC will perform identically.

Virtual machines

A virtual firewall depends on the hypervisor, storage, virtual switch, host, and management network. Configure the hypervisor bridge carefully, prefer efficient virtual NICs such as VirtIO when supported, and reserve adequate CPU for high-throughput VPN or IDS workloads.

Snapshots are not a substitute for configuration backups and can create operational problems when a stateful firewall is rolled back while clients, leases, VPN peers, or upstream systems retain newer state. Separate the firewall’s management path from the production path where practical, and document what happens when the host or storage reboots.

Cloud deployments

Cloud firewalls must be designed together with provider security groups, route tables, network interfaces, source/destination checks, public IP behavior, NAT, availability zones, and instance throughput limits. A guest firewall does not replace the cloud provider’s network controls.

VyOS is generally a natural fit for cloud and virtual routing. pfSense also documents AWS and Azure deployment paths. Confirm marketplace charges, image availability, licensing, interface limits, and the provider’s routing model before choosing a cloud firewall.

Embedded devices

OpenWrt requires the most device-specific hardware planning. Check the exact model and revision, flash and RAM, wireless chipset, switch and VLAN support, recovery method, image type, partition layout, and whether the device has sufficient resources for VPN or inspection workloads. A failed flash without a recovery path can turn a low-cost router into unusable hardware.

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What features should you compare before choosing?

Feature checkboxes are not enough because a feature may be built in, plugin-based, third-party, edition-limited, subscription-dependent, or workload-dependent. Compare the following before deployment:

Capability	Questions to ask	Why the distinction matters
IPv4 and IPv6 firewalling	Are both protocols filtered, logged, and configured through the same operational workflow?	Untested IPv6 can bypass an otherwise careful IPv4 policy.
VLANs and zones	Can trusted, guest, IoT, lab, and management networks be separated cleanly?	Segmentation limits lateral movement and reduces policy ambiguity.
Multi-WAN	Does failover or load balancing cover the required health checks, policy routing, and VPN behavior?	Basic dual-WAN support may not cover real failover requirements.
VPN	Are WireGuard, OpenVPN, and IPsec available for both remote access and site-to-site use?	Protocol availability does not guarantee equal performance or management quality.
IDS/IPS	Is inspection built in, optional, plugin-based, subscription-backed, or absent?	Inspection can consume substantial CPU, RAM, storage, and administrative time.
DNS and web filtering	Is filtering local, plugin-based, or dependent on an external threat-intelligence service?	A third-party DNS service does not replace firewall policy or endpoint security.
QoS and traffic shaping	Can the platform prioritize latency-sensitive traffic under congestion?	Traffic shaping is useful only when hardware and policies match the link.
High availability	Are state synchronization, failover links, configuration replication, and recovery documented?	A second firewall is not automatically a working HA system.
Automation	Is there an API, structured CLI, configuration export, or version-control-friendly workflow?	Automation reduces configuration drift and makes repeatable recovery easier.
Backup and restore	Can encrypted secrets, certificates, plugins, and compatible configuration be restored?	An exported configuration without keys or package state may not restore service.

How should you install and harden a self-hosted firewall?

1. Download the installer only from the official project site and verify checksums or signatures where the project provides them.
2. Keep the WAN disconnected during initial installation and configuration.
3. Change default administrator credentials immediately.
4. Restrict management access to a trusted interface or management VLAN.
5. Enable HTTPS and multifactor authentication where supported.
6. Configure reliable NTP and make the time source deliberate.
7. Configure DNS, DHCP, VLANs, NAT, and remote administration intentionally rather than accepting broad defaults.
8. Export an encrypted configuration backup and separately preserve certificates, private keys, recovery media, and administrator documentation.
9. Apply updates only after confirming console or out-of-band access and a rollback or replacement plan.
10. Test IPv4 and IPv6 inbound filtering, outbound policy, DNS, DHCP, VLAN isolation, VPN access, logging, and reboot behavior.
11. Monitor logs and alerts, and periodically test that backups can actually restore the gateway.

What are the main risks of self-hosting a firewall?

Self-hosting a firewall transfers responsibility for hardware, updates, configuration, monitoring, backup, and incident recovery to the administrator. Open-source software can reduce vendor dependency, but open source does not eliminate electricity, replacement hardware, support, threat-intelligence, cloud, or administrator costs.

More features can reduce reliability. IDS/IPS, web filtering, proxying, traffic analysis, VPNs, and verbose logging can exhaust CPU, memory, storage, or bandwidth on hardware that handles basic NAT comfortably. NIC drivers, offloading behavior, interrupt handling, VLAN support, and virtualization settings can matter more than the CPU model alone.

A firewall cannot compensate for unpatched clients, exposed administration interfaces, weak Wi-Fi security, poor identity controls, flat networks, insecure IoT devices, careless port forwarding, absent backups, or missing monitoring. IPv6 must be tested explicitly, including inbound filtering, router advertisements, DHCPv6, prefix delegation, neighbor discovery, VPN behavior, logs, and parity with IPv4 policy.

What should you avoid in an open source firewall comparison?

Avoid treating every project as equally current. A functioning website does not prove that a community edition still exists, receives security updates, has working downloads, or remains open source in the same sense as another project.

• Do not describe “free” as automatically meaning fully open source.
• Do not compare OpenWrt, VyOS, Shorewall, OpenBSD, OPNsense, and pfSense as identical appliance products.
• Do not publish unsupported throughput or security rankings.
• Do not assume cheap multi-port hardware has equally good NIC drivers or recovery options.
• Do not recommend NethSecurity or Endian solely because an old list includes them.
• Do not treat Smoothwall, ClearOS, or Arista Untangle as current open-source firewall recommendations without confirming a maintained, downloadable, appropriately licensed edition.

Commercial appliances may be preferable when formal lifecycle policies, centralized management, hardware acceleration, compliance documentation, vendor support, or managed security services matter more than source availability and self-hosting freedom.

Which commercial hardware and services complement these platforms?

Commercial products are not open source firewall distributions, but commercial hardware and support can solve real deployment problems. Readers can evaluate Netgate appliances for the pfSense ecosystem and Deciso hardware for OPNsense deployments. Purpose-built appliances can provide known-compatible NICs, storage, support, and lower deployment friction than repurposed hardware.

OpenWrt users should select hardware from the project’s verified compatibility information rather than an arbitrary marketplace listing. VyOS users may evaluate commercial support or subscriptions when the deployment requires supported images, cloud routing, or enterprise assistance, but current pricing and terms should be checked on the official VyOS pricing page before publication or purchase.

Managed DNS and filtering services can add malware, phishing, family, or content controls, but they do not replace firewall rules, endpoint protection, secure administration, or network segmentation.

Frequently Asked Questions

Is OPNsense better than pfSense Community Edition?

OPNsense is the better default recommendation for many new GUI-based deployments, while pfSense Community Edition remains a strong choice for administrators who value maturity, existing knowledge, and extensive historical documentation. The better option depends on hardware compatibility, required packages, licensing preferences, support needs, and the platform the administrator can maintain reliably.

Which open source firewall is best for a home network?

OPNsense is the best general-purpose home firewall when a dedicated x86-64 appliance or virtual machine is available. OpenWrt is usually better when the home network depends on a supported embedded router with integrated Wi-Fi and low power consumption.

Can OpenWrt replace OPNsense or pfSense?

OpenWrt can replace OPNsense or pfSense for many routing, VLAN, wireless, NAT, DNS, and VPN deployments, but OpenWrt is an embedded router operating system rather than the same appliance category. Device-specific installation, recovery, hardware limits, and the availability of inspection features must be checked first.

Is Shorewall a complete firewall distribution?

Shorewall is a GNU/Linux firewall configuration framework, not a complete firewall appliance operating system. Shorewall requires the administrator to select, harden, update, monitor, back up, and recover the underlying Linux distribution.

Are open source firewalls free to operate?

Open source firewalls may be free to download, but operation can still require appliance hardware, replacement storage, electricity, paid support, commercial plugins, threat-intelligence or DNS services, cloud marketplace charges, backups, monitoring, and administrator time.

The Bottom Line

For most readers, choose OPNsense. Choose pfSense Community Edition when maturity and existing expertise are more important; OpenWrt for a verified embedded router; IPFire for a Linux appliance; VyOS for CLI-driven routing and automation; OpenBSD for minimal Unix control; and Shorewall when Linux configuration files are the real requirement. Treat NethSecurity and Endian as conditional choices until current release, licensing, support, and community-edition evidence is confirmed.

Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.