I was at the Northern Tool on P'tree Ind Blvd today. They had a stack og .50 caliber ammo boxes, while the supply lasts, for $7.95 each.
They looked to in nice shape. I didn't have time to open one.
You might want to call around to the Northern Tool near you to see if they have them at your store?

these guys are near savnnah
http://www.dixietriggers.com/surplus.html
and i get mine from armygear.net quick shipping and the cans are in great shape