Chams are well known for getting tired of crickets and going on hunger strikes. Plus keeping crickets gets to be expensive. You either buy a dozen at a time which is pricey and you have to go to the store every day or two, or you buy 200 crickets (buying more than 200 for 1 cham tends to be a waste), pay shipping and hope that half of them live long enough to be fed off. I personally use crickets as a treat. My main feeder is dubias but as they get older panthers tend to get bored with them as well so I also started a colony of orange heads and green bananas. Even if you don't want to raise roaches, you could buy dubias like 500 at a time and have very few dead. I also I raise Vietnamese stick insects which I got from Andee, a member here.
To keep them from getting too bored I do a bug order about once a month. last order was 200 crickets which I feed off first. I got 100 Black soldier fly larvae (aka BSFL, Calci Worms, Repti Worms, Phoenix Worms) They last a few weeks before pupating, but if you can get a dorm fridge set on the lowest setting and put on a proper timer you can adjust the fridge to to 50 - 60 degrees and they last for months. I bought blue bottle fly larvae but did not get very many to hatch into flies. Some times I get horn worms but they are pricey and grow way fast... get smaller size than you think you need.
I know.. I get long winded.... I have as much fun with my bugs as I do my chams.