I camped out at a Wal-Mart that's close to another (New Milford, CT - near the Danbury, CT Wally.)
The NM store had a small crapload of 9mm coming in on their truck. I waited it out until that truck got there, and then I bought two boxes for me, two boxes for a buddy, and some Winchester SuperX .22 ammo I have been needing. That set me up for 6 boxes, which is their cap.
The truck hadn't gotten to Danbury yet, so I went today. They supposedly had .45, 9mm, .40, and .38, but no .22. By the time I got there, the 9mm and .45 were gone, and I bought the last box of .38 WWB. I also bought the last two boxes of .223 for trade (I don't own a .223, but know lots of people who will appreciate whatever they can get.) There must have been 3 cases of .40 left, though.
Supposedly they have another truck coming tonight with the .22 on it. Neither store had the bulky packs, but the hundred rounds of SuperX I bought was 5.97 - it's high, but I am pretty sure it's a little better ammo, and six bones still isn't bad. .22 is all I can seem to afford shooting these days.
I simply never thought the day would come when I would have to search for .22. Welcome to Russia, kids. Even my super-anti gun girlfriend is weirded out by the shortage.
ALSO...
There is apparently some way they can scan the UPC of the item you want with their little stocking gun scanner and tell you whether or not it will be on the next truck in, if that little tidbit helps any of you. Apparently, the trucks come in at varying times, but if you ask nicely, some folks will unload ammo off the truck and bring it up to you special, rather than you just waiting for it to hit a shelf.