Microage97: See if there's a food coop nearby that you can join. Coops usually let you order bulk foods, such as sacks of grains, at significant discounts. Some health food stores will also give you a bulk discount without joining, but it will be less of a discount than a coop.
By the way, I highly reccomend buying quinoa and amaranth for your emergency food supplies. They are extremely nutritious and both complete proteins, tasty, and last a very long time. I beleive amaranth loosely translates into "long-lived seed", or something along those lines.