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Degu
While chinchilla prices start at $100, their lesser-known look-alike, the degu, is about the same price as a gerbil. These exotics have high populations in the pet trade but not many people know about them. Still, being small rodents, they breed prolifically and can end up in animal shelters, so it would be a good idea to check there before purchasing one. Their upkeep is also not terribly expensive, being very similar to rat care in cost.
