General Knoppix support for those who've read the FAQ at the Wiki
CISCO ASA5512-X ADAPTIVE SECURITY APPLIANCE 1U FIREWALL 120GB SSD 6 PORT BB-15
$106.13
* LOT OF 4* WatchGuard XTM2 Series (FS1E5) Firebox Firewall Router
$67.07
Check Point U-40 10 Port Gigabit Ethernet Firewall
$80.00
Ubiquiti Networks USG Unifi Security Gateway Router/Firewall ** FAST Shipping **
$46.99
Palo Alto PA-220 Next-Gen Firewall 750-000128-00A w/ Power adapter
$68.00
Netgate SG-3100 pfSense Security Gateway Firewall Appliance w/Power Adapter 32GB
$150.00
Fortinet Fg-300E FORTIGATE 300E Network Security Firewall Appliance
$249.00
Protectli The Vault 4-Port Firewall Network Appliance FW108120 51524F17
$149.95
FORTINET FORTIGATE 100D FG-100D NETWORK VPN SECURITY FIREWALL
$90.24
$60.00