I used to eat taco bell a LOT and I'd toss the yellow or otherwise unappetizing tomato cubes and bits of lettuce to the crickets. I hear potatoes are used quite a bit. Try broccoli if you want to get some calcium in them (do not use cheese, the crickets love it but so far as I know reptiles aren't equipped to deal with lactose, and I don't know that the crickets could break it down to anything useful or even benign... might be ok if you're feeding your crickets to a mammal).The guy never really mentioned how to keep the crickets alive or what to feed them