I think Best But is #1 in consumer electronics. They offer low price and wide range of brands on almost everything. I like to check their weekly deals. The Reward Zone Program is very useful for frequent consumers.
I recently brought a Nintendo DSi XL from this store and while it was in stock and produced immediately for the price listed, I was disappointed by the lack of cheap accessories. The selection of protective cases and screen protectors were not varied or reasonably priced.