General Knoppix support for those who've read the FAQ at the Wiki
Supermicro 1U X11DPU 2x Xeon Gold 6132 2.6GHz / 128gb / 10x 2.5 Trays / 2x 750w
$649.99
1U Supermicro Server 10 Bay 2x Intel Xeon 3.3Ghz 8C 128GB RAM 480GB SSD 2x 10GBE
$273.00
1U 20" Short Depth Server Firewall PFSense X11SSH-F Xeon 3.5Ghz 32GB RAM NVME
$247.00
Supermicro SYS-5019P-M Server Xeon Scalable 6138 20 Cores 40 Threads 48gb DDR4
$330.00
HP ProLiant Xeon E3-1220L V2 MicroServer Gen8 2.30 GHz 16 GB RAM NO DRIVES
$199.00
Genuine HP ProLiant MicroServer Gen8 Intel Pentium G2020T 2.5GHz 712318-001
$199.95
HP ProLiant Xeon E3-1220L V2 MicroServer Gen8 2.30 GHz 16 GB RAM NO DRIVESorCads
$200.00
Open Eye OE-MTX08 8TB Micro Server With Linux (Boots To Login) No Accessories
$294.95
1U BareMetal pfsense opnsense Router Firewall DNS Server 6x 10GB Ethernet Ports
$149.00
1U Supermicro Server X10DRU-i+ 2x Xeon Total 36 Cores 64GB 4x 10GBE-T 2PS
$314.00