Amazon plus TIV tracker. Allowed me to keep buying games (from them) most of the year. It may be its last year in this spot, though, considering recent trends.
Amazon for the variety of deals throughout the year (gotta love the free-app-a-day run), least of which were console games, if only because the price-match 'button' doesn't always produce the desired results.
As awesome as Best Buy's Mega Deal was, I can't support it as I only managed to get 2 of them.
I'll go instead with Google Marketplace/Amazon appstore 10 cent apps for a week or so (most were games). Made my December CC statement quite a few pages long.
GoHastings gave me quite a few headaches with faulty used games and hardware, but their CS is top notch and shows they're trying hard.
I'll go with Overstock for their dreadful shipping times and poor CS.