Try feeding freshly molted roaches and flipping them on their backs so they kick their legs around (if your chameleon willingly hand feeds, a plastic spoon is helpful to keep them on their back without letting them flip over.
Superworms (morio worms) are easy to breed and cost very little to get the set up started. It takes a little time to get them to pupate and turn into beetles, but so long that it isn't worth it. Mealworms are also extremely easy, but they aren't the best feeders to use regularly.
Other roaches (especially colorful ones, like green banana roaches) are a possibility. You can also buy giant land snails and breed those. Stick insects (especiallly the Indian ones) are very easy to breed and keep. Mantids are also a possibility, but they require more care since you have to feed them other insects. Butterflies/moths (like large whites, small whites, painted ladies, some sphinx moths, some silkmoths [not the same as the silkworms we usually use] and other non-toxic kinds) are a possibility.
