General Knoppix support for those who've read the FAQ at the Wiki
Palo Alto PA-220 Next Generation Firewall Appliance w/ Power Adapter and Cord
$62.99
Fortinet FortiGate 60F | 10 Gbps Firewall Network Security EXPIRED (FG-60F)- New
$226.79
LOT OF 2: FORTINET FORTIGATE-50E FG-50E NETWORK SECURITY FIREWALL W/ (1x) AC
$84.95
Palo Alto PA-220 Next-Gen Firewall 750-000128-00A w/ Power adapter
$62.00
Dell SonicWALL TZ300 Firewall Appliance Transfer Ready - NO AC
$12.20
Cisco Meraki MX84 Cloud Managed Security Firewall Appliance UNCLAIMED MX84-HW
$39.99
Cisco ASA5506-K9 ASA 5506-X Network Security Firewall
$40.00
Protectli The Vault 4-Port Firewall Network Appliance FW108120
$125.00
Fortinet Fortigate FG-61E Firewall Network Security Appliance ATP Bundle 1 years
$263.99
Firewall pfSense 2.7.2 Release 8GB Memory - Dual NIC 1 GB - 120GB SSD
$99.77