I feed pinkies, worms, fish filets (salmon, yellow perch, tilapia, etc), and silversides to my garters. No gelatin involved. It's not particularly expensive, just cut off and defrost what you need from the frozen fish and buy worms every couple weeks. They don't really like the silversides or pinkies too much, but they'll eat them and it's good for them to have whole things vs filets.
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