General Knoppix support for those who've read the FAQ at the Wiki
Cisco ASA5525-FTD-K9 Security Appliance with FirePower Services
$1000.00
Genuine Fortinet FortiGate 60E-POE Firewall Network Security ATP Bundle 2 years
$263.99
Fortinet Fortiwifi 60D FG-60D Security Appliance Firewall / VPN w/ AC Adapter
$34.97
Palo Alto PA-220 Security Appliance Firewall - NO Power adapter -
$33.00
Ubiquiti Networks UniFi Security Gateway - White (USG-3P)
$49.00
Sophos RED 15 Rev.1 Firewall With Power Adapter
$70.00
Fortinet FortiGate 60C FG-60C Router Firewall Security Appliance - TESTED -
$18.99
Barracuda Networks X300 VPN Firewall Network Security 6x 1GbE Port NSA1120A-X300
$40.23
Cisco Meraki MX68 Cloud Managed Security Appliance Unclaimed w/ Power Adapter
$155.95
1U BareMetal pfsense opnsense Router Firewall DNS Server 6x 10GB Ethernet Ports
$149.00