When I was buying pet store crickets, I was spending easily $40+ a week to feed my juvie. If you buy in bulk, it shouldn't be too bad. A baby can (and mine did) devour 40-60 crickets a day, but that only lasts a year. Protein only makes up 10-15% of the adult diet, so even if you don't breed dubia or start a super colony, buying bugs locally becomes sustainable once they mature.