The French Knoppix site, http://knoppixfr.tuxfamily.org/, has translated their hardware database into english: http://knoppixfr.tuxfamily.org/index.php?page=hardware There are not a lot of listings yet, and the site surely doesn't reflect the large amount of hardware that works under knoppix, but hopefully it will grow.
Vintage Tandy Radio Shack Pocket Computer PC-4 with 72pg manual and sleeve
$59.00
Vintage Intel Personal PC CPU Collection in White Shadowbox Display
$200.00
VINTAGE SummaGraphics SummaMouse
$240.00
Complete First 20 Years Collection of Vintage Intel Personal PC CPUs w/Shadowbox
$350.00
Vintage IBM 5150 5160 Personal Computer PC XT Drive cover Factory
$79.99
Vintage Classic Apple Macintosh System Boot Install Disk Floppy/CD *Pick Version
$10.39
Z80 - NABU PC & Keyboard - Vintage New Old Stock (Retro 80's)
$139.99
Vintage Compaq 141649-004 2 Button PS/2 Gray Mouse M-S34 - FAST SHIPPING - NEW
$8.99
SEALED Vintage Western Digital Value Line Hard Drive 3.5-Inch Enhanced IDE 25 GB
$100.00
Vintage Computer Chip Gold White Ceramic Intel C1702A Static EPROM 2048-bit 1972
$95.00