I was fortunate to get a Wii for my kids for Christmas, but my sister was still looking for one for her son, so I was helping her find one. It was one day last week, I think it was December 30th, we went to the mall to return some things and we went in to Gamestop to look at some games. I casually asked if they had any Wii's and the guy said "we sure do". So of course, being the nice sister that I am, I bought it for her. The guy on line behind me couldn't believe it either. I think at this point its just luck. I heard a couple of people went to Target and asked and they had some there. Anytime I asked at Target, it was always a "no". I know the Toys R Us near me didn't have any, but they had plenty of games and controller gloves (but no extra controllers).
Good luck