I bought mine on E-bay, I actually got a good price considering the demand, with the games and controllers I figured I paid about $50.00 over what the retail cost would have been. EBgames is selling them for shipment on 12/18, I just didn't want all the games and extras they put in their bundle.
Right now the best deal is the 360 since you can get them anywhere, and the games really are something on an HD setup.

A computer once beat me at chess, but it was no match for me at kick boxing.