General Knoppix support for those who've read the FAQ at the Wiki
IBM Power 740 8205-E6D Express 8-SFF Power7+ 4.2GHz CPU 64GB RAM *No HDD* Server
$239.99
IBM Power S822 12-Bay Server System Power8 Core 3.42Ghz DVD-Rom Drive 64GB No HD
$349.99
IBM x3550 M4 7042-CR8 6-Bay Server System Intel Xeon E5-2640v2 2.50Ghz 8GB No HD
$419.99
IBM Power S822 8284-22A 12SFF Power8 3.89GHz 6Core 64GB RAM No HDD Server System
$359.99
IBM System x3550 M3 Dual Intel Xeon X5650 @2.67GHz 32GB RAM No HDD
$84.50
IBM SYSTEM x3200 M2 Server - HDD wiped, No OS
$75.00
IBM Server eServer | IBMR1000 | UPS 1000VA 700W W/New Batteries
$115.00
IBM 7944AC1 System x3550 M3 Server 1*Intel Xeon X5650 2.67GHz 4GB SEE NOTES
$26.97
1U IBM x3550 M5 4 Bay SFF SAS3 Server 2x E5-2683 V3 28 Core 128GB DDR4 2x Tray
$318.00
IBM QRadar xx29 Server 4412Q2A
$293.99