General Knoppix support for those who've read the FAQ at the Wiki
NetFu Firewall 1U, Intel CPU, 8 x Gigabit, SFP, w/ pfSense, Others, NEW OPTIONS
$677.31
Juniper Networks SRX-210 Secure Services Gateway VPN Firewall
$39.99
NEW NetFu Firewall Mini, Intel CPU, 6 Port Gigabit, w/ pfSense, others
$420.00
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
Firewalla Purple SE - Cyber Security Firewall with cables and power supply
$200.00
Ubiquiti Networks UniFi Security Gateway - White (USG-3P)
$49.00
$400.00
Genuine Fortinet FortiGate 60E-POE Firewall Network Security ATP Bundle 2 years
$263.99
Paloalto Networks PAN-PA-220 Security Firewall Appliance W/Rack Mount + Dual PSU
$79.99