Where R U in TX? If you R in Houston, teh Command Post has the best in-store deals. Dallas and San Antonio mil-surplus stores also have great deals but watch out for those with online stores. They'll quote you a much higher in-store price and they won't honor the online pricing at all.
In Houston, I can get 30Cal for $7ea, 50Cal for $12, Fat 50 for $15, 40mm for $15 (or $17?), and 20mm for $18ea (or $20?) at the Command Post. They have 8 stores, so call the one you're visiting first to see what they have and the price. The one I go to is on the SW corner of Beltway 8 just east of Hwy59. These prices are as of late Spring2010.
Also, since you're in TEXAS, go to the gun show. I know there's a decent deal once in a while.
Online, you'll pay a fortune for packaging and shipping.