General Knoppix support for those who've read the FAQ at the Wiki
ASRock B550M Pro SE AM4 DDR4 SATA 6Gb/s 1 PCIe 4.0 x16 Micro ATX Motherboard
$84.99
Gigabyte GA-Q170M-D3H-GSM LGA1151 DDR4 Desktop Motherboard (No I/O Plate)
$39.99
MSI H81M-P33 Desktop Motherboard Intel MicroATX Socket LGA1150 USB 3.0 W/IO
$26.99
Asrock Z390 Phantom Gaming 4S/AC Wifi 8th/9th Gen Intel 1151 Motherboard Bulk
$33.43
ASUS B250 Mining Expert LGA1151 Motherboard w/ 16GB DDR4 Ram Included
$59.99
Asus Prime H310M-A R2.0 Intel LGA 1151 DDR4 Desktop Motherboard
$54.99
Gigabyte Aorus Ultra Durable B550 AORUS ELITE AX V2 Desktop Motherboard
$29.80
GIGABYTE GA-X99-UD4P MOTHERBOARD, M.2 SATA3, LGA2011-3, DDR4, & I/O Shield
$69.99
MSI PRO B650-P WiFi AMD AM5 DDR5 WiFi 6E ProSeries Motherboard
$112.95
Supermicro X10SRH-CF ATX Intel C612 LGA2011 DDR4 ATX Motherboard TrueNAS PFSense
$144.00