Walmart is like any other store where the local store has some control over what they order. The corp has a huge inventory and the local store managers or department heads can order things they want from it. This way items that don't sell in a certain market are not stocked in the stores. What happens is since thats controlled by humans they sometimes might not order enough or decide that some products don't sell well enough during certain seasons so they might sell a different group of product. So no two stores are exactly alike since there is some control the people in charge have over inventory.