www.banjohangout.org has an items for sale section. They ask for a very small portion of the transaction price, I think two or two and a half per cent. I think that something similar here might work if it was only available to members. There have been some threads here on people having been ripped off on e-bay. Given that Mudcat is much more of a "community" than most other sites I think that there would be much less chance of getting burned here.