Hmm with those restrictions, the only feeder that springs to mind would be silk worms. However, they are not all that easy to breed, the eggs take quite a while to hatch and you need to be able to order mulberry leaves, as that is all that they eat. That being said, they do make excellent, nutritious feeders. They are one of the only worms low in fat and can be a constant part of an animal's diet.
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