This is rumor and speculation, but there I know there are some of you out there trying to get your mitts on a Wii.
The latest rumor I've heard is to try Toys R Us on the 11th (next week). supposedly they have been holding on to their systems for yet another big-number sale.
My suggestion would be to stay up until 12:00AM Sunday (watch SNL or some movies, I guess) and then check their online ad. That should let you know for sure. Hopefully you won't need to camp out.
Good luck on trying to find them