General Knoppix support for those who've read the FAQ at the Wiki
Dell PowerEdge R720 Server - 2x8c CPU,256Gb RAM, 128Gb SSD/3x900Gb SAS, Proxmox
$340.00
Dell PowerEdge R620 Server 2x E5-2660 v1 2.2GHz 16 Cores 256GB RAM 2x 300GB HDD
$89.99
Dell PowerEdge R730XD 28 Core Server 2X Xeon E5-2680 V4 H730 128GB RAM No HDD
$389.99
CTO Dell PowerEdge R630 Server, 2x Xeon E5-2620V4, 64GB- 512GB RAM, 480GB SSDs
$246.67
DELL POWEREDGE T430 SERVER W/ DUAL XEON E5-2609 CPU & 16GB MEMORY
$329.00
Dell Poweredge R620 8-Bay CTO Pick your CPU & RAM Config | H710 Raid | 2x PSU
$209.99
Dell Poweredge T430 8 Bay Server Dual Xeon E5-2683 V4 32 Cores 64GB DDR4 2X SSD
$799.00
Dell PowerEdge R620 4-Bay Server 2x Xeon E5-2690 8 Core 2.9GHz 32GB No HDD H710P
$95.63
DELL PowerEdge R730 Server 2x E5-2680v4 2.4GHz =28 Cores 32GB H730 4xRJ45
$284.00
PowerEdge R710 Rackmount Server 80GB RAM 2x XEON E5520 CPU 4.75TB
$200.00