Canned foods are the cheapest way to go. I dehydrate some of my own and seal it in canning jars.
http://www.freerepublic.com/focus/bloggers/3116028/posts
Walmart started sell Augason Farms food on the website with free shipping for orders over $50.00.
I don’t recommend ‘kits’ as I believe you are better off buying the fixings and cooking, less waste more variety.
Thanks!