General Knoppix support for those who've read the FAQ at the Wiki
DELL PowerEdge R730 Server 2x E5-2640v4 2.4GHz =20 Cores 32GB H730 4xRJ45
$259.00
Dell PowerEdge R630 Server Barebone with Motherboard 2 x Heat Sink 2 x 750W PSU
$149.99
1U 20" Short Depth Server Firewall PFSense X11SSH-F Xeon 3.5Ghz 32GB RAM NVME
$247.00
Dell Poweredge R720 8-Bay 2U Server 2* Intel Xeon E5-2690 2.90Ghz 96GB No HDD
$239.99
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
Dell R630 8 Port SFF 2x E5-2690v4 28-Cores H730P 256GB Server RJ-45 iDRAC ENT
$479.00
HP Proliant DL360 Gen9 28 Core SFF Server 2X E5-2680 V4 16GB RAM P440ar No HDD
$203.14