BlountArrow nailed it. Wal*Mart has enough buying power that they can order things they way they want them, to get the price point where they want it.
For example, this tire is produced by Goodyear FOR Wal*Mart, and ONLY for Wal*Mart:
Got a set of these on my grand cherokee and LOVE EM! as for the land terrains the other guy was talkin about I had them on a bronco and you slide in the front yard! they sucked! come to think about it that may have helped with the 2 barrel rolls it took... as for guns ive got an older savage110 243 from wally world bought in 99' I believe, that will hold its own against anything else in the safe! if its a good price, its what you want and it goes boom when you pull the trigger then just shoot the dammed thing!
To think Wal*Mart can't call up a supplier and tell them what they want it a little naive.