I was going to suggest Ebay, but you have to be careful!
I'll admit that I've fallen under the eBay spell myself. I've since learned that eBay is not automatically cheaper. In fact, I've seen stuff get bid up to ridiculous amounts - I feel like shouting at the other bidders, saying "Don't you know it's USED?! That you'll need it checked out first before using?! That a brand-new one costs about the same?!"
But then I quiet down and realize I've got some stuff to sell myself, so let the bidding begin!
