Lego is unique in the fact that is has two very juxtaposed markets: one, with parents and other uninformed people selling Lego at a cheap price, and another with collectors avidly buying Lego. This market dichotomy benefits us who sell Lego. That's why in spring, look around your local tag sales and yard sales. You'll be amazed what you can pull up. Recently I found an entirely intact 4855 Spiderman's Train rescue set--for $10. These finds can bring in profits of 300-400%. There aren't many other easily avaliable products that can boast the same turnover.