Fuzzies are way too small for a BP, the average hatchling is generally started on hoppers and quickly move to small adult and adults.

Your BP should be eating something way bigger than what he is eating now

Generally you will find adults at petco however not the other sizes since they do not really sell feeders.

If you want feeders in various sizes you will need to find a pet store selling feeders or someone local to you that breed feeders.