We've actually started allowing layaway on ps3s and Wii at GameStop this past week. It's a practice we only enabled for the first time this past holiday, since all three consoles were in relatively short supply. We disabled the option in January, but since supply still hasn't caught up with demand, the option is available again for Wii/ps3.
Edit:
And for the inevitable doubters about the limited supply:
http://www.gamestop.com/Catalog/productDetails.aspx?sku=020321
Not only is it backordered through the website, but type in my zip code (70001) for in-store availability, and you get this:
That 100 miles includes not only the New Orleans area, but also most of the Baton Rouge area.