Well in my area (Phoenix, Northwest part of it, to be specific) the Best Buys, etc had stacks of Xbox arcade models, Xbox Premiums, and PS3's of the 40 and 80GB size. No Wii's of course. Hell, I went in to the biggest Best Buy in the area yesterday and you couldn't even get a Wii CONTROLLER. Shelf was bare. Only thing you could get Wii related was games of course, chargers for the Wii-mote and 3 of the pink Wii-mote 'condoms' as I call them. :) Plenty of PS3's and 360's there though.
It's been pretty much like that through Xmas. Looks like Sony and MS did a good job keeping retailers stocked, although at smaller stores like game stores, there were plenty of times that they were out of either. And of course, you couldn't SNIFF at a Wii at and of the game stores. Most of 'em even have their display Wii's (IF they have one) locked up tighter than Fort Knox in glass cages that are reinforced by wire! Wow!