Well, if you're in Minnesota, you can get Tamas at Wal*Mart. But really, rarely, you can't because once they are on shelves, they're gone. I wanted to buy my friend a Music Star for her B-day, so we had to go to at least 3 different cities. Anyways, in Minnesota, you could also try Toys R Us HERE, although you said Wal*Mart AND Toys R Us are going to stop. I know that if you're not from Minnesota, this doesn't help, so yeah.
I have NO IDEAS on any other new stores that would keep them in stalk. But, maybe Wallgreens will help, because that's one of the places where they are spotted.