I have an "American Harvest" dehydrator, about 16" diameter with a good temperature control.
I did the math = the first 25lb case of Roma tomatoes that I dried and packed in herbed olive oil was worth
a small fortune at grocery store prices. Fantastic garnish on just about anything.
Nibbles for whoever is the chef du jour.
Then, I started to make jerky with beef and bison mince.
I have to hide it to have any left for a forest trip.
The machine has paid for itself many times over.
They are worth the investment, even if you're only a casual user.