General Knoppix support for those who've read the FAQ at the Wiki
SuperMicro 815-7 | 2x Xeon Gold 6128@3.4GHz | 128GB RAM | 2x PSU *NO OS/HDD*
$497.99
1U BareMetal pfsense opnsense Router Firewall DNS Server 6x 10GB Ethernet Ports
$149.00
1U Supermicro Server 10 Bay 2x Intel Xeon 3.3Ghz 8C 128GB RAM 480GB SSD 2x 10GBE
$273.00
Supermicro CSE-825-7 X10DRW-i 2 Xeon E5-2667v4 3.2GHz SAS3 2U One Power Supply
$219.75
FOR PARTS - HPE ProLiant MicroServer Gen10 Plus Server
$199.95
SuperMicro Server 505-2 Intel Atom 2.4GHz 8GB RAM SYS-5018A-FTN4 1U Rackmount
$202.49
SuperMicro Server E3-1230v6 X11SSL-F 32GB RAM (2x16GB)
$150.00
Supermicro 505-2 Mini-1U Server 5018A-FTN4 16GB 2.4ghz Atom + Rack Ears
$183.08
SUPERMICRO CSE-512 AMD Opteron Processor 6128, 32GB DDR3 RAM NO HDD
$90.00
1U 20" Short Depth Server Firewall PFSense X11SSH-F Xeon 3.5Ghz 32GB RAM NVME
$247.00