While I got mine for less than $80, which was VERY cheap for one with a digital display in it I am not overly pleased with my Polaroid PDC640. Takes bad dark pictures, only has 8mb of storage, and the resolution is just to small. For the price I suppose it wasn't that bad, but I'd like to get at about a 2.0Mp Olympus for the replacement.
IMO, Best Buy is way overpriced, if you want to window shop they are a good place but ebay is a nice place to buy them. Of course you only want to buy with a person who has a LOT of good feedback, brand new (shrink wrapped) with full warranty, not reconditioned, yada yada.... A lot of shady people there willing to sell you their crap.