This is a pretty cool site. It lists ammo, availability, and prices by the minute. This is set for 7.62x54r, but if you look across the top, you can select other calibers.
http://www.gunbot.net/ammo/762x54/
CDFingers
Gunbot Ammo Finder
1Crazy cat peekin' through a lace bandana
like a one-eyed Cheshire, like a diamond-eyed Jack
like a one-eyed Cheshire, like a diamond-eyed Jack