An online auction that will connect people together, a community for competitive bidding? Any suggestions?
You can start with sites like brandbucket, logopond, flippa etc for some inspiration.
It's going to be either very expensive or nearly impossible to find one word domain. So your best bet it to try two word names.
I might be able to help you come up with a name. Drop me message and we can do a quick 15-30 mins free call to do some brain storming together.