Sportsman's Guide is similar to CTD and they also have a Buyer's Club which gives a 5% discount on ammo purchases. They have some sales periodically in which one can get some decent prices even after shipping, but the back order can be lengthy. I ordered some brass cased, reloadable .45 ACP for $6.25 a box a year ago Feburary and they finally came through in October. I haven't seen that deal since and wish I would have bought more. Able Ammo has had some decent prices in the past but I haven't ordered from them in a long time. MidwayUSA, Graf and Son, Natchez Shooter Supply, and others I can't think of off hand (pick up a copy of Gun List or Shotgun News, there are a number of places selling inexpensive ammo) all have clearance sales at times where the prices can be pretty good. If you don't reload, Cabela's sells Wolf brand in bulk lots, 500 rounds of .45 ACP for $80 and 1000 at $150. Get 3% back in points for future purchases and you can save more if you use the various promotions that come in the mail. Currently, one can get $20 off any purchase of $150 or more. If you don't have a Cabela's in your state you save sales tax too. They also sell Sellier & Bellot and Magtech .45 ACP ammo for $10/50. Otherwise, Wal-Mart has been the best value for me for jacketed bullets; the Winchester White Box in 100 packs for under $20 is about the best around. For lead bullets, UltraMax remanufactured at Dick's is the cheapest I've found; $30/200 rounds with sales dropping the price to $25.