Might be good for huffing paint?
Try ordering on line.
Its probably just an item that sells very well. In my experience (I am a very frequent shopper of Walmart), they are generally very good at keeping items in stock, but with certain items, it can be difficult because they literally sell faster than they are stocked. If you have the Walmart app you should be able to order it & get it shipped to the store, or your home
Did you try to order them online? Try their website.
If I were you I would order on line. That way you always have a supply.
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