Hoping to shop from the comfort of home, I'd been using Wiialerts. The site specializes in Web stores and repeatedly alerted me to available Wiis, but I could not snag one. So I went back to iTrackr, which emphasizes brick-and-mortar stores and can hunt a number of products. I queried about a Wii, and it told me a local Gamestop store had them.
A quick trip out and I had a Wii, at the suggested retail price of $249.99.