General Knoppix support for those who've read the FAQ at the Wiki
1U BareMetal pfsense opnsense Router Firewall DNS Server 6x 10GB Ethernet Ports
$149.00
Custom Server 15" Depth X11SSH-F E3-1270 V6 3.8Ghz 4 Core - 128GB NVME 32GB RAM
$399.00
SuperMicro SuperServer 5038MR-H8TRF Blade w/X10SRD-F Board E5-2630v3 Proc 128GB
$263.96
ReachEngine Supermicro 119-7 X9DRW-7/iTPF 2X E5-2660v2 132GB DDR3 NO HDD/OS #73
$136.00
Supermicro Server 505-2 Intel 2.4GHz 16GB SYS-5018A-FTN4 - pfSense Compatible
$220.48
HP ProLiant MicroServer Gen8 G8 G2020T 8GB RAM 4x 1TB HDD 4x 3.5" 712318-421
$279.99
1U Supermicro Server 10 Bay 2x Intel Xeon 3.3Ghz 8C 128GB RAM 480GB SSD 2x 10GBE
$273.00
SuperMicro CSE-836 16LFF Server X9SCL+-F Xeon E3-1220V2 3.10GHz CPU 8GB RAM
$169.99
Supermicro 1U Server X9DRW-3LN4F+ 2x E5-2680 2.7ghz / 128gb / 8xTrays / 2x 700w
$229.99
Supermicro 1U Server X9DRW-iF 2x E5-2680 v2 2.8ghz / 128gb / 4xTrays / 2x 700w
$219.99