The app said the 86th St Walmart had 100rd Federal .223 "in stock", so I drove up there though I was skeptical.
No .223 to be found.
I saw some 45/410 so just for kicks and giggles I searched for that. It showed "out of stock", but I was looking at it plain as day on the shelf. Same item # and all.
The app is probably somewhat accurate for .270 and shotshells, but for in-demand ammo it's unreliable and spotty at best.
38 I called yesterday when I saw the same in stock flag around 4:30. Sporting goods said he had 4 boxes coming in on the truck and that they would not be out till 7 am today. Not sure it helps you get some but would explain the in stock being on its way to stock....