It depends on where that particular store is located. I have a post on this on the budget board. I check 10 different Wal-Marts within driving distance. Two of them had the higher priced items, the other eight were cheaper.
These are all stores within 60 miles of each other.
It seems the stores in the more populated areas are the cheap ones. Additionally, some stores were offering 42" plasma TV's, and other stores didn't have them at all.