General Knoppix support for those who've read the FAQ at the Wiki
Dell PowerEdge R730xd Server 2.60Ghz 32-Core 64GB 800GB SSD Debian Linux
$836.80
Red Hat Enterprise Linux 5 Server - New and Sealed
$16.99
Red Hat Enterprise Linux 5 Server RHF032US-R1 NEW Sealed
$59.95
Open Eye OE-MTX08 8TB Micro Server With Linux (Boots To Login) No Accessories
$294.95
Dell PowerEdge R210 II Rackmount Server Xeon E31220L 16Gb 1TB + 500GB LINUX 6.6
$179.00
1U BareMetal pfsense opnsense Router Firewall DNS Server 6x 10GB Ethernet Ports
$149.00
PFSENSE 15" Depth Server Router Firewall Supermicro X11SSH-F E3-1240 V5 32GB RAM
$382.00
IBM 9006-22C 12 Bay LFF SAS3 12G Dual 22 Core 2.6GHz Power9 P9 Linux Server
$2799.99
1U Open Source Router Firewall X10SLH-N6-ST031 E3-1270 V3 6x 10GB Ethernet 16GB
$419.00
VPS Windows / Linux Server - 12GB RAM, 4 Core, 1 TB HD, Unltd. bandwidth 1 Year
$272.60