General Knoppix support for those who've read the FAQ at the Wiki
Dell R730xd 26 Port SFF 2x E5-2697v4 36-Cores H730 128GB Server 2x SFP 10G ENT
$490.00
Dell Poweredge R210 II Server Xeon E3-1220 v2 3.1ghz Quad Core / NoRam / 1x Tray
$69.99
Dell PowerEdge R630 Server Barebone with Motherboard 2 x Heat Sink 2 x 750W PSU
$149.99
Dell Poweredge R330 4-Bay Server System Intel Xeon E3-1220 v5 3.00Ghz 8GB No HD
$104.99
Dell PowerEdge R630 Server 2x E5-2680 V4 = 28 Cores S130 32GB RAM NEW 480GB SSD
$208.99
Dell PowerEdge R420 Dual Intel Xeon E5-2440 v2 @1.90GHz 32GB RAM No HDD H710
$74.50
Dell PowerEdge R620 Server 2x E5-2660 v2 2.2GHz 20 Cores 256GB RAM 1x 480GB SSD
$139.99
Dell PowerEdge R620 Server - 256GB RAM, 2x8cCPU, 120Gb SSD/3x900Gb SAS, Proxmox
$320.00
1U 20" Short Depth Server Firewall PFSense X11SSH-F Xeon 3.5Ghz 32GB RAM NVME
$247.00
Dell Poweredge R630 Server 2x E5-2620 V4 =16 Cores | S130 | 32GB RAM | 2x trays
$229.99