I bought this one in 2012 but haven't used it haha. It's apparently kickass, though. If you search on Amazon for Food Dehydrators you can find some good ones. The top results is the same brand as mine, probably a newer model.
https://www.amazon.com/Nesco-FD-75PR-Food-Dehydrator/dp/B000FFVJ3C
And some extra trays and your set. The fruit roll up trays work good also.
I think I have a different one then you. Mine does have several temperature settings. It's this one Nesco FD-75PR
I bought this dehydrator after reading through several "which dehydrator should I buy" threads on reddit. I'm in Australia so I had to get a step down transformer (that's 2000w, you only need 800w to run the dehydrator).
The first thing I watched was Good Eats season 9, episode 03 - youtube linkie here. The recipe he uses can be modified pretty easily. I sort of cheat a little bit for my 'boutique' marinades; I use Nandos Peri-Peri marinade to make peri-peri jerky (just left it for 2 days in the fridge) and this weird terayki sauce I found in a korean store :P
For the super spicy one I used Alton's recipe and just added a bugger-ton of chilli. Really helps with keto, on nibble and you feel like drinking 600ml of water!
I don't have one, but at just $51, it might be a good option to look into. Thanks!