This isn't on topic with your question, but did you ever think of organizing a yard sale in your neighborhood and the things that didn't sell allow people to put them on bidmonkey? You could make it a big event with a press release and so on. Just a thought.

You could even go to flea markets, when they're closing up, and hand-out flyers about how great bidmonkey is and talk with your "potentials".

Just some thoughts, sorry if they are too off topic.