General Knoppix support for those who've read the FAQ at the Wiki
1U Supermicro Server 10 Bay 2x Intel Xeon 3.3Ghz 8C 128GB RAM 480GB SSD 2x 10GBE
$273.00
Supermicro 1U Server X9SRI-F Xeon E5-2640 v2 2.5Ghz 16-Cores / 64GB / No HDD
$149.99
1U 20" Short Depth Server Firewall PFSense X11SSH-F Xeon 3.5Ghz 32GB RAM NVME
$247.00
1U BareMetal pfsense opnsense Router Firewall DNS Server 6x 10GB Ethernet Ports
$149.00
Barracuda Supermicro CSE-825 X10DRH-CT 720w PSU 2U 8 Bay Dual E5-2620V4 32GB
$189.95
HP ProLiant MicroServer Gen8 G8 G2020T 8GB RAM 4x 1TB HDD 4x 3.5" 712318-421
$279.99
HP ProLiant MicroServer Gen8 Desktop Computer Intel Core i3-3240 8GB Ram
$224.99
HP Proliant HSTNS-5151 Microserver (618364-005) NO HARD DRIVES - WORKS
$149.99
Supermicro 2U Server 12 Caddy Bay 3.5 LFF E ATX Storage Chassis SAS2 6GBPS Rail
$199.00
ReachEngine Supermicro 119-7 X9DRW-7/iTPF 2X E5-2660v2 132GB DDR3 NO HDD/OS #73
$136.00