I just dehydrated apples in the oven. They're good, but it took so long. I'm thinking of buying a dehydrator. I know it will still take a long time, but at least that is what it's made for and my oven will still be usable. Is there a brand that's best? Or one to stay away from? How much should I expect to pay? I saw one on amazon for $40, that seems too good to be true. But I don't want to spend $250 (also saw that on amazon). Thanks in advance for any advice.