After learning that many of the usual suppliers of MRE's (meals ready to eat) in the US were sold out with no guarantee on back order, we came across a ready supply by accident.
A local chapter of the boy scouts has a sign out front of their headquarters about a supply of MRE's for sale.
They're actually not that terrible.
A local camping supply store had a pretty good supply and could get more too.
We found an organic farmer in our area who acts as a local distributor for a whole host of grains, including lots of delicious varieties he grows himself, and at about 60% of retail prices, with 1, 10, and 25 KG bags available.
http://www.oakmanorfarms.ca/