General Knoppix support for those who've read the FAQ at the Wiki
1U Open Source Router Firewall X10SLH-N6-ST031 E3-1270 V3 6x 10GB Ethernet 16GB
$419.00
1U 10 SFF Bay Supermicro Server X10DRW-iT 2x Xeon E5-2690 V4 128GB DDR4 RAM
$399.00
1U BareMetal pfsense opnsense Router Firewall DNS Server 6x 10GB Ethernet Ports
$149.00
Globalscale Technologies DreamPlug AppNeta M22 Linux Server Dual GB Ethernet
$24.99
Custom Server 15" Depth X11SSH-F E3-1270 V6 3.8Ghz 4 Core - 128GB NVME 32GB RAM
$399.00
Globalscale Technologies DreamPlug AppNeta M22 Linux Server Dual GB Ethernet
$21.99
PFSENSE 15" Depth Server Router Firewall Supermicro X11SSH-F E3-1240 V5 32GB RAM
$382.00
Linux 23 in 1 Bootable Windows Alternative Collection Live Distro Mint Ubuntu OS
$18.95
1U Server 15" Depth X11SSH-F E3-1270 V6 3.8Ghz 4 Core 32GB RAM 240G SSD
$320.00
1U Supermicro Server 10 Bay 2x Intel Xeon 3.4Ghz Total 12 Cores 64GB DDR4 2x 10
$399.00