General Knoppix support for those who've read the FAQ at the Wiki
Cisco ASA 5508-X Firewall Adaptive Security Appliance with Power Cord Lot Of 2
$169.98
Cisco ASA5506-K9 ASA 5506-X Network Security Firewall
$40.00
Fortinet FortiGate 60F FG-60F Network Security Firewall Appliance
$199.99
Palo Alto PA-220 Next-Gen Firewall 750-000128-00A w/ Power adapter
$68.00
Sophos SG 210 Rev. 2 8-Port Gigabit Ethernet Rackmount Network Firewall
$109.95
Protectli The Vault 4-Port Firewall Network Appliance FW108120 51524F17
$149.95
Palo Alto Networks PA-220 Enterprise Firewall
$59.00
Fortinet FortiGate 100D Next Generation Firewall (FG-100D)
$59.99
Netgear ProSecure UTM9S Firewall + Wireless-N Module | 6 x GB RJ45 Ports
$79.99
NEW Sophos SG-105 Rev 2 UTM Firewall Security Appliance 8-Port w/Power Adapter
$100.00