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
Dell PowerEdge R630 Server 2x E5-2680 V4 = 28 Cores S130 32GB RAM NEW 480GB SSD
$239.99
Dell PowerEdge R620 Server 2x E5-2660 v2 2.2GHz 20 Cores 256GB RAM 1x 480GB SSD
$139.99
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 R240 Server - 32Gb Ram, 16Tb SAS, 6c 3.3Ghz CPU, H330, iDrac Ent
$620.00
Dell PowerEdge R620 Server - 256GB RAM, 2x8cCPU, 120Gb SSD/3x900Gb SAS, Proxmox
$320.00
Dell Poweredge R620 2x E5-2640 2.5ghz 12-Cores / 16gb / H710 / 2x Trays / 750w
$74.99
Dell PowerEdge R330 DRPS 8 Bay Server-CTO Wholesale Custom to Order
$251.13