If you start feeding crickets I suggest you breed them as they are really expensive
all you have to do is get a relativly big storage container, put in cat biscuits, a wet piece of sponge in a jar lid lots of choped up egg cartons and a container filled with moist vermiculite sand or even dirt.
They will breed and the females will lay eggs in to the sand vermiculite or dirt. Quite intresting to watch.