Really--half the things asked about here don't need a thread, a large amount of them are commonly found on ebay, amazon etc and you can easily gather prices from looking at that. Those sites define the going rate, and their facts are more useful than some random guy's opinion of what he would pay for them or what he saw them sell for.
This forum is for things that are rare and don't pop up very often, not the stack of common Xbox 360 or PS1 games you got at a yard sale.