Found some good old glory from the past while looking for other stuff in my junkyard
ABIT IC7-MAX3 (fully working and booting); 70 euro
ASUS P4P800 E (fully working and booting): 50 euro
ASUS P4C800 E DLX (fully working and booting); 60 euro
ASUS P4C800 E DLX ( booting but no image output): 25 euro
ASUS P4GPL-X (fully working and booting): 25 euro
DFI NF4 LANParty SLi (working and booting); 85 euro
MSI K8N Platinum (fully working and booting); 40 euro
ASUS K8V SE Deluxe (fully working and booting); 30 euro
I have no clue what to ask for these boards,, so maybe we need to check what they are still worth