You can also win the Dehydrator from the Prize Machine in the Mayor's Manor. If you choose the Mushroom Cave ( Demetrius will visit to offer this or a Fruit Bat Cave, after you earn 25,000g), a ...

And even then, you can only buy a Banana Sapling from the Island Trader. But once you have grown a banana tree, you can save the fruit and use it in the dehydrator. When it's all done, you can sell ...