Brass Bombers is a reseller of milsurp brass. Quite adamant about it too. They can't spell though. I fixed it for here. snicker.)
Prices seem to be good though. Compared to Midway anyway. Their Brass in an ammo can thing is good. $189.99 per 1,000 for new FC brass. $129.00 per 1250 from Brass Bombers AND you get a .50 cal ammo can. $17.99 by itself from Midway. Handy things they are too.
"ONLY Military grade once fired brass purchased and personally received from U.S. military installations. We do NOT buy brass from private parties, pick it up a ranges, purchase through a wholesaler or any other source, private or public."
Buying components on-line is usually not a good idea. Shipping costs(that are set by the carrier not the seller) will negate any cost savings. .223 is not scarce nor particularly expensive stuff. Your local gun shop can order anything you want in any quantity you want. You should be prepared to pay up front though.