General Knoppix support for those who've read the FAQ at the Wiki
HP ProLiant ML350 Gen 9 Server 64GB RAM 2.4GHz Xeon 12-Core E5-2667 v3
$300.00
HP Z420 Workstation Xeon E5-2690 v2 3ghz 10-Cores 64gb 512gb SSD 4TB Win10
$239.99
HP Z440 Workstation 18 core Xeon E5-2699 V3 64GB 1TB SSD R5-340X WIFI WINDOWS 11
$189.99
Lenovo Thinkstation P510 E5-1620 V4 16GB RAM 512GB SSD DVD Quadro M2000 W10 Pro
$164.95
SR1XP Intel Xeon E5-2680 v3 12 Core 30MB 2.5GHz LGA 2011-3 Grade A Processor
$3.97
Intel Xeon Gold 6140 SR3AX 2.3GHz 18-Core Processor CPU
$35.19
Intel Xeon E5-2697A v4 SR2K1 2.60GHz 40MB 16-Core LGA2011-3 CPU Processor
$39.99
INTEL XEON E5-2699V4 2.2 GHz 22-CORE SR2JS CM8066002022506
$138.50
HP Z440 Workstation 18Cores Xeon E5-2699 V3 128GB 1TB SSD 2TB WIFI WIN11 R5-340X
$369.99
Intel Xeon E3-1285 V3 3.6 GHz 8M Quad-Core SR14W CPU Processor
$49.50