General Knoppix support for those who've read the FAQ at the Wiki
Fortinet FortiGate-40C Network Security Firewall
$42.50
Cisco ASA 5520 Adaptive Security Appliance
$56.75
PALO-ALTO NETWORKS PA-3050 SWITCH
$59.99
Palo Alto PA-220 Security Appliance Firewall - NO Power adapter -
$33.00
Ubiquiti Networks Unifi Security Gateway Pro 4 USG-PRO-4
$99.97
Dell SonicWALL nsa 2700-Transfer Ready
$1500.00
Cisco ASA5506-K9 ASA 5506-X Network Security Firewall
$49.99
Ubiquiti Networks UniFi Security Gateway - White (USG-3P)
$49.00
Genuine Fortinet FortiGate 60E-POE Firewall Network Security ATP Bundle 2 years
$263.99
Cisco Meraki MX68 Cloud Managed Security Appliance Unclaimed w/ Power Adapter
$157.95