I have a friend that does that with expensive Canon DSLR bodies. He bought the original 10D there. Then when the 20D came out, he took the well worn 10D there, and got 100 bucks back and the 20D. Couple weeks ago did the same thing when the 30D came out. Got a couple hundred clams and a brand new camera. Needless to say I smashed out his car windows and stole the F**kin thing so that I wouldn't have to here about his heroic feats at Costco ever again. Rotten SOB.