George Hotz is running an Ebay auction for the world's second unlocked iPhone. His blog details the ten steps it took to do it. This second (his person phone is the first) phone can be yours (currently) for a mere $2,175. Better yet, you could just follow the steps on his blog, unlock it yourself and only pay cost at the Apple Store.
image by George Hotz
8/25 update: George has pulled the listing because he felt too many bids were fraudulent.