Altho it's been a long time since I worked at it very hard, I made time to be in the right place at the right times in 2 local Walmarts today.
Around 9:30 a.m. one store still had 5 boxes of Federal 45, so I "limited out" with 3 of 'em, otd with 150 rounds for about $70. "The crowd" had already come and gone for the morning and when I left, the only pistol ammo on the shelf was 2 more boxes of 45.
Around 6 pm was able to catch clerk unloading a cart in the midst of about a half dozen people who were waiting around. First guy in line snagged the only 2 bulk packs of 22, but the rest of us got "satisfied" with 3 box limit of calibers we came for. Mine was otd with 3 Federal 100 round value packs of 9mm for about $70.