General Knoppix support for those who've read the FAQ at the Wiki
Dell Poweredge R630 2x Xeon E5-2680 v4 2.4ghz 28-Cores / 128gb / H330 / 2x 1TB
$279.99
Dell PowerEdge R430 Server 2x E5-2680 V4 = 28 Cores H730 32GB RAM 2x 3TB SAS
$316.99
Dell PowerEdge R630 Server 2x E5-2680 V4 = 28 Cores H730 32GB RAM 2x 1.2TB SAS
$373.99
Dell R630 8 Port SFF 2x E5-2690v4 28-Cores H730P 256GB Server RJ-45 iDRAC ENT
$479.00
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
R630 DELL 8 x 2.5'' POWEREDGE 2X E5-2680V4 32GB RAM IDRAC ENT & NDC 2X 495W PSU
$172.95
DELL PowerEdge R630 8SFF Server 2x E5-2690v4 2.6GHz =28 Cores 64GB H730 4xRJ45
$346.00