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 R420 Dual Intel Xeon E5-2440 v2 @1.90GHz 32GB RAM No HDD H710
$74.50
Dell PowerEdge R620 Server - 256GB RAM, 2x8cCPU, 120Gb SSD/3x900Gb SAS, Proxmox
$320.00
Dell PowerEdge R620 Server 2x E5-2660 v2 2.2GHz 20 Cores 256GB RAM 1x 480GB SSD
$139.99
R630 DELL 8 x 2.5'' POWEREDGE 2X E5-2680V4 32GB RAM IDRAC ENT & NDC 2X 495W PSU
$172.95
Dell Poweredge R730xd LFF 14-Bay 2U Server | Choose Your CPU & RAM Config
$447.99
Dell PowerEdge R630 Server | 2x E5-2680 V4 =28 Cores | H730 | Choose RAM/ Drives
$321.99
R630 DELL OEM 10X2.5'' 2X E5-2660V3 32GB RAM 2X750W PSU SERVER POWEREDGE
$159.95
Dell Poweredge R720 2x Xeon E5-2670 v2 2.5GHz 20-Cores / 128gb / 600gb / H710
$249.99
DELL PowerEdge R430 8SFF 2x E5-2640v3 2.6GHz =16 Cores 32GB H730 4xRJ45
$208.00