Look at Walmarts own corporate statement which even admits to price differences between stores.
http://corporate.walmart.com/frequently-asked-questions
Why is there a price difference between Walmart stores?
Prices may vary from store to store because each store is required to manage its own inventory. Therefore, a manager may lower a price to clear out an overstock item, to reward customers with an in-store sale, or to compete with local merchants. It is not our policy to price match our own stores or our online service since we are not in competition with ourselves.
If you would like more information on pricing policy, you may contact your local store management.
Yet again, I’m not denying assertions made about stores in other areas, and yes, managers in our area can place an item or item category on clearance and do. But your statements have been to the effect that prices in general are much higher at certain Walmarts than others in the same region and that’s definitely not the case here.
Our three stores are in one market, basically (although one tends to have more Hispanic-oriented goods), and there is no price customization store by store to compete with local merchants since they are all competing with the same local merchants basically.