I've found it to be pretty useless using their site to check ammo inventory, or inventory of anything in high demand for that matter. It sounds like the stores in your area are a bit better at keeping their stock levels up to date. I have a couple walmarts in my area that show "limited stock" of Federal 45 bulk packs when their ammo dept guys say they haven't seen any in 4 weeks. I have had zero luck using the inventory checker to snag ammo. I have had luck, however, at befriending the ammo guys at a couple of the walmarts and getting some insight on when they put their ammo on the shelves and even a pattern that one of the guys noticed which resulted in me snagging some 45 FMJ.
Based on my recent trips, it seems theyre becoming better stocked. The ammo guys confirmed this and said the demand hasn't slowed but they're finally getting more in and are keeping it on the shelves longer.