Gun Bot is awesome if you are looking for something specific! It really gives you a great list of items and what it's status is. Only problem is, it also tells you when stuff is out-of-stock and I haven't been able to find my WPA 30-06 FMJ ammo for a while I've been really interested in it but it has always been out of stock... it's been a while since I checked though...
My local walmart has gotten all of their orders for ammo from the gun scare a few months back. They have around 2000 9mm and the same in .40cal. Probably 10k .223 and 7.62x39.... BUT no .270, .243 or 30-30...... GREAT