If I were you I'd look for an industrial or shipping supply company. you will want to use plastic drums or steel drums with plastic liners, and don't forget the desiccant. Unless you want to buy individually packaged dried food from camping stores I expect that you will have to spring for shipping. You may be able to get your self bulk beans or wheat from a local farm or grain elevator, inquire at your local farm supply store.

The shipping typically isn't that rough on bulk items like this, and the premiums you pay for a local vendor may actually cost you more than you save. Don't forget a barrel of clean water.

Also if you buy food that is not packaged (like grain from a grain elevator) you might want to fill the container with CO2 or N2 to protect the contents. Desiccants will ward off fungus but there are insects that can make it using the carbohydrates and O2.

USA Emergency is only $12 shipping no matter how much you order.
Also look for an online promo code and maybe save even more!

I had 6 superpails, a grain mill, some smaller items all shipped for $12! I don't know how they do it!!

My mother's friend is Mormon and they store a LOT of food. They use metal garbage cans with lids because they stated that rats and mice can eat through plastic. Just purchase some clean metal garbage cans with lids and then you can store the food inside in plastic sealed bags. They use one of those food savers which sucks the air out of the bag, and then seals them. I hope this helps some. I know you can get metal garbage cans at local hardware stores.