When my parents first bought our house, there was a bunch of books and crap from the previous owner in there. We obviously won't read them, so maybe those could be sold. I don't know, I would think it's easier to do digital shipping, but I don't know what I would do with that. I would hope people want books though :l
Well, I only earn credits from doing surveys & such instead of buying them, and I really don't have any good things to sell. The most valuable thing I would be willing to sell is a Captain Skyhawk for NES I got from a thrift store that I don't even know works. Frankly, I'm quite cheap with the things I can sell. I can't afford the really good things on this website :P