http://www.shopgoodwill.com/
this is something like ebay, but i think cheaper. the downside is you have to work out any problems yourself. i've bought minor things here that didn't cost much and had no trouble. it's definitely worth looking at. also, i think, not sure,that the money, or at least part, goes to goodwill charities.
as usual, watch out for high shipping costs and read the bottom descriptions carefully.