Very expensive. In the $10K and on up range. Best to invest in a good pressure caner, a couple of hundred $ for a good one. Caned foods will not keep for 10+s of years like freezed dried and are good for up to a year or a little more. A good rotation and re-caning will do for most emergency food supply.
http://www.reusablecanninglids.com/
Don't forget to buy canning lids. These reusable ones look interesting. I've bought three dozens to try but haven't put them to use yet.
"In fact, despite the best-before date, the food has an almost indefinite shelf life if kept at moderate temperatures. Food canned more than 100 years ago and recovered from sunken ships can still be biologically safe to eat."
For personal use, a pressure canner is a better investment. But my question was in the context of a possible business start-up. It seems there is a high demand for freeze-dried foods, and too little supply. To the right entrepreneur, that means opportunity.