I think I can get to 1500 Kcal for under $5. 1 can of Spam dehydrated (4 oz dehydrated from a 12 oz can), 2 oz of instant refried beans, and 2 oz of minute rice, plus a little Santa Fe seasoning. The Spam alone is almost 1200 Kcal. I bought a can here locally in Anchorage for $2.57, I dehydrated a can of refrieds that cost me 78 cents, and the rice I priced at about 18 cents. The teaspoon of seasoning mix was probably another 15 cents. Boil uup a cup or so of water, and you will have an outright feast. You might get more calories by the ounce just eating the equivalent of peanut butter, but just barely. I can only eat so much peanut butter at one time, though, and usually get some serious indigestion if I eat more than a couple ounces at a time.

You would not want to eat my concoction regularly either, for it would make you far from it in short order.