I stopped by a Wal-Mart in southeastern Pennsylvania yesterday and found none of what you saw. Considered myself lucky to pick up a few boxes of shotgun slugs.
This one is in a small town (around 2500) and is a small Wal-Mart.
Maybe once a month, I stop by a supercenter in DeFuniak Springs. It seems to mirror pretty closely the small one. At one time they were just about out of everything. This was after Christmas which probably explained part of it.