General Knoppix support for those who've read the FAQ at the Wiki
Fortinet FortiGate-40C Network Security Firewall
$42.50
NetFu Firewall 1U, Intel CPU, 8 x Gigabit, SFP, w/ pfSense, Others, NEW OPTIONS
$541.85
NEW NetFu Firewall Mini, Intel CPU, 6 Port Gigabit, w/ pfSense, others
$336.00
Ubiquiti Networks USG Unifi Security Gateway Router/Firewall w/AC Adapter TESTED
$54.99
Palo Alto PA-220 Security Appliance Firewall - NO Power adapter -
$33.00
Fortinet Fortiwifi 60D FG-60D Security Appliance Firewall / VPN w/ AC Adapter
$34.97
Cisco ASA5506-K9 ASA 5506-X Network Security Firewall
$49.99
Ubiquiti Networks UniFi Security Gateway - White (USG-3P)
$49.00
Check Point UTM-1 570(U-20) Firewall Security Appliance Switch
$110.00
Genuine Fortinet FortiGate 60E-POE Firewall Network Security ATP Bundle 2 years
$263.99