Assuming these stores want to carry it.
I'm sure BB will sell it since they already carry consumer Macs, and ATT will carry the 3G model. However, I'm guessing WM & Target will take a wait and see. They aren't going to want to risk space on an untested consumer device and, frankly, I'm sure Apple doesn't want to gamble on WM & Target employees trying to "sell" it, possibly damaging the brand.