Because this thread was scaring me (more), I went out earlier today to the closest store that sells ammo (a local hardware store).
In the calibers I need there was no problem finding cartons on the shelf. I had four brands of 9mm Luger to choose from, many 22lr blocks and cartons, and my trusty Wolf 7.62x54r (for Mosin-Nagant).
There definitely were empty spaces on the shelves, but I couldn't read most of the designations leaning over the counter. I did notice there was plenty of 45 Auto available -- even the 250 blocks.
There was also plenty of .223 sitting right on the counter but I don’t know much about AR-15 ammo. It is possible that in another week this will be all gone.
WHere do you live? My guess is it’s not PA.