General Knoppix support for those who've read the FAQ at the Wiki
DELL PowerEdge R730 Server 2x E5-2699v3 2.3GHz =36 Cores 32GB H730 4xRJ45
$325.00
Dell PowerEdge R620 Dual Intel Xeon E5-2697 v2 @2.70GHz 128GB RAM No HDD S110
$144.50
Dell R630 Server 2x E5-2620 V4 2.1GHz =16 Cores 128GB DDR4 1x 960GB 2x 1G 2x 10G
$345.00
Dell PowerEdge R730, 2 sinks, SystemBoard, 8 trays,H330,Idrac 8 exp, 2x750w Psu
$135.00
Dell PowerEdge R430 - E5-2640 v3 2.60GHz 16GB RAM - NO HDDs
$119.99
Dell Poweredge R720 8x 2.5" Bay Xeon E5-2650 2.8GHz 8 Cores / 64gb No HDD
$114.97
CTO Dell PowerEdge R630 Server, 2x Xeon E5-2620V4, 64GB- 512GB RAM, 480GB SSDs
$326.67
Dell PowerEdge R740XD 12X3.5"LFF H330 RAID 750W Server CTO Support customization
$6.00
DELL PowerEdge R730 Server 2x E5-2680v4 2.4GHz =28 Cores 64GB H730 4xRJ45
$318.00
DELL PowerEdge R520,Server 2x Xeon E5-2440 0, 32GB DDR3L, No HDDs, No OS, "A"
$149.99