It's super easy - my brother was the Lizard King until a few years ago and he had his own little cricket hatchery in the basement. I haven't checked your list of herpets, but I remember he had bearded dragons, fire-bellied toads, leopard geckos and a whole bunch of other things. He and his wife used to love setting up new habitats, but they let it all go after the first few kids, and that seemed reasonable to me, but I know you've got even more children than they do, and you still seem sane.
It's an act :-). I'll tell Bill to get to work raising crickets; if he succeeds, I'll pay him what we're currently spending at Petsmart.
A good question.