General Knoppix support for those who've read the FAQ at the Wiki
IBM CS821 20-Core 2.827GHz 128Gb 1.92Tb SSD 1U Linux Server - 8005-12N Power 8
$449.96
Red Hat Enterprise Linux 5 Server - New and Sealed
$16.99
Asus ESC4000 G3 Barebones 0GB HDD Linux
$200.00
Toshiba Magnia SG20 VPN Linux server Web server (No HDD, *Read*) -
$41.39
1U BareMetal pfsense opnsense Router Firewall DNS Server 6x 10GB Ethernet Ports
$149.00
IBM Power8 S822L 20-Core 3.42GHz 256Gb 1.2Tb 40G Elastic Storage Server 5148-22L
$599.95
IBM E850 Power8 2x 12C 3.02GHz 512Gb 1.8Tb SAS 10GbE 16Gb Linux Server 8408-E8E
$674.96
PFSENSE 15" Depth Server Supermicro X11SSH-F E3-1240 V5 V6 - 256GB NVME 32GB RAM
$399.00
IBM System X 3250 M5 Single Xeon Quad Core E3-1220 v3 @3.1GHz,8GB RAM,Linux SUSE
$199.87
Dell PowerEdge R730xd Server 2.60Ghz 32-Core 64GB 800GB SSD Debian Linux
$836.80