I have read that Circuit City, Best Buy and Target are all going to be offering Wiis for sale this coming Sunday. Target and Circuit City open at 8 a.m. (I think Best Buy is opening up at 10 a.m. since Christmas is just around the corner).
I swung by TRU this morning just to go for the Super Mario Galaxy (2nd Wii 50% off) deal, and one manager said the first guy who showed up to wait was around 2 a.m. this morning. They got in 36. Sadly, TRU didn't have a 2nd Wii title I wanted as their selection wasn't well stocked, so I left...
FYI - a couple of stores (CC and BB) will be offering Wii consoles for sale this coming Sunday, so get there early enough to get a ticket/voucher and bring Wii home.
Sadly, even a year later, if you want a Wii, your best bet is to read the sales circulars on Saturday, and if a store advertises the Wii to be on sale, you'll need to get there a bit early on Sunday and hope you're in luck. Otherwise, make friend with one of the sales associate and slip them...