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
$334.99
2U 12 Bay SAS3 SuperMicro Server 6028U-TR4T+ W/ X10DRU-i+ Barebone 12 Caddy RAIL
$299.00
Dell PowerEdge R710 2.5" 2U Server 2x X5670 2.93GHZ 12-Core 128gb 2x 1TB SAS
$114.99
1U Supermicro Server X10DRU-i+ 2x Xeon Total 36 Cores 64GB 4x 10GBE-T 2PS
$333.00
Dell PowerEdge R620 Server 2x E5-2660 v2 2.2GHz 20 Cores 256GB RAM 1x 480GB SSD
$125.99
Dell PowerEdge R730XD 28 Core Server 2X Xeon E5-2680 V4 H730 128GB RAM No HDD
$389.99
Dell PowerEdge R620 Server - 256GB RAM, 2x8cCPU, 120Gb SSD/3x900Gb SAS, Proxmox
$320.00
Lenovo ThinkServer TS140 Xeon E3-1225v3 3.20GHz 16GB RAM Tower Server Needs HDD
$99.99
Dell Poweredge R210 II Server Xeon E3-1220 v2 3.1ghz Quad Core / 16gb / 1x Tray
$129.99
Dell PowerEdge R640 40 Core Server 2X Gold 6148 H730P CTO- Custom- Wholesale
$734.99