Its true, Wii's are starting to actually stay in the stores. We've had wii's overnight twice in the last month. That hasnt ever happened before. If you want to know some tips on getting one, here's what I've picked up from being close with them since launch.
Weekdays are basically anything goes. Anyone 'could' have them in stock. Though when it comes to eb games and gamestops, they get shipments in usually around 11 to 1, and could have wii's on any weekday. They get no shipments on weekends, so it's futile to check unless they got them on friday and no one bought. I'd give any in your area a call around noonish. If one store says they got some but are sold out, call another gamestop. They usually get them in on the same day.
Weekends, as I said, eb games and gamestops are no go (this includes Software Etc. and babbages). Mostly, I hear people dropping by a fred meyer sunday mornings, and finding them then. Larger department stores should also carry them every couple of weekends.
These'll all be standard basic 250 dollar set ups. I know costco usually gets a ton at a time, but they usually only sell them in bundles.