You should try calling a distribution center. They're going to know more about when new products are going out than the regular Wal-Marts. The stores won't know until they have to make shelf space, which will probably only be about 48-72 hours in advance at most.
Same as grocery stores.
Sometimes if you actually go to the Wal-Mart, you can find someone who'll help you, but who wants to actually go to a Wal-Mart unless it's life and death.
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