A few years ago I was buying Winchester 223 White Box ammo for a friend who liked it so much that he didn't bother reloading. I was traveling through a couple of states on a semi-regular basis and every time I was near a Wal-Mart I would stop in and pick up some for him.
I noticed a disparity of two to three dollars per box depending on the location of the store, I questioned a manager about it and was told that each store can sets its own price on items since the managers have a better idea of what the market will bear locally. I suspect that the Corporate office has some guidelines on this but it does make a lot of sense.
drover
