Not much at all. I’ve made salmon, venison, and beef jerky - at most the meat contracts maybe 18 to 20 percent in size. If you have a multi level dehydrator and do it in bulk you can make it very cheap. Bonus is you can season it any way you like. I love teriyaki salmon and super spicy beef with mustard powder and onion.
You need to go to Sam’s or Costco and buy meat in bulk. Buying it from the supermarket is what kills you.