Try Natchez, 800-251-7839. Natchez is selling Sellier and Bellot .45 ACP for $8.10 per box, plus shipping and handling ($3.90 per order). That is about $156 per case (850 rounds) delivered. Natchez is also selling S&B .223 for $2.89 and S&B 9mm for $5.39. Natchez does not add a surcharge for credit cards.
I have tried Aguila 9mm. Other than seeing a lot of muzzle flash on a couple of boxes, it was fine.
[This message has been edited by Cawdor (edited January 04, 2000).]