General Knoppix support for those who've read the FAQ at the Wiki
Fortinet FortiGate 60F | 10 Gbps Firewall Network Security EXPIRED (FG-60F)- New
$226.79
Palo Alto PA-220 Next Generation Firewall Appliance w/ Power Adapter and Cord
$59.99
Palo Alto PA-820 Firewall Security Appliance
$120.00
Cisco Meraki MX84 Cloud Managed Security Firewall Appliance UNCLAIMED MX84-HW
$39.99
Dell SonicWall TZ300 5 Port Network Security Firewall Appliance APL28-0B4
$39.99
Cisco ASA5506-K9 ASA 5506-X Network Security Firewall
$40.00
Cisco Meraki Z3 VPN Firewall - Black
$15.00
JUNIPER NETWORKS NETSCREEN VPN FIREWALL 5GT Model: NS-5GT-101 + Cord
$12.00
Sophos XG310 Rev 1 Security Appliance Firewall Device XG 310 Distributed Edge 1U
$172.49
1U BareMetal pfsense opnsense Router Firewall DNS Server 6x 10GB Ethernet Ports
$149.00