Hornworms usually always work for my boys. If all else fails I hit the neighborhood field and go huntin for anything safe. Just make sure to research and identify insects and give them 12-24 hours for gut loading and hydration. I've heard nothing but bad about mealworms and their exoskeleton being difficult to digest. You could try supers a.k.a. Cham crack, I usually poke a hole in them with a safety pin before feeding to make them easier to digest. Good luck!