I agree that it depends on your budget, but also your needs. I have 5 dehydrators, the oldest being 30 years old! They are a fairly simply stacking tray with a cover set up. I think they are about $20-$30 at Wal Mart and Wally World also has the accomanying supplies, like jerky and fruit roll up trays, jerky spices and such.
I have looked at the fancy expensive ones, but even using mine to dry herbs for sale, I still don't think it's worth it. One thing about the cheap ones is that if you only need to dry one tray, you can leave the others off. I notice that the fancy ones don't seem to be able to do that.