I culture red wiggler worms (AKA composting worms), like a slightly smaller version of earthworms except much easier to culture.
I have an 18g rubbermaid bin of them in my garage and feed them fruit, veggie and paper scraps. I feed up to a couple of times per week and always have plenty for my 50+ tank fishroom.
Haven't bought live or frozen food in years.
I just collect them from the bin, rinse them in a fishnet over a small pail and feed directly.
Google red wigglers or composting worms or check Craigslist for local sources.
Matt