Store managers at Wal-Mart don't order anything. Everything's run centrally from Bentonville. Stuff comes in on the truck, it gets put on the shelf. Nobody knows what's on the truck, or cares. That's why when you ask "when will [whatever] be back in stock?", nobody can give you a truthful answer.
At least, that's how it was done a few years ago. I'd be surprised if it has changed.