Best advice, don't grow night crawlers. Grow Canadian redworms, they eat your garbage and grow like crazy. Can withstand much higher temps and you can sell/use the leftovers for gardening. They get prety big, not as huge as a big crawler but have some decent size to them.
Mealworms, Live crickets Red Worms at Worm Man's Worm and Crickets Farm will give you all you need for worms and raising your own. If it is not on the they have always been very helpful in getting you the answers you need.