I heard they eat lettuce in captivity. Ive tried looking for websites that sell these and have had no luck. Cham's eat a good amount of these in the wild so your cham should be all smiles
I recently bought some decent sized sticks on ebay.co.uk. I'm not sure if they sell them live on the American one, but they were pretty cheap too. Lettuce isn't very good as a gutload food, but they also eat dandelion and brambles which are better.
Would you mind telling us how you keep and breed them?
I ask because i read that they usually take more than 4 months to hatch and it would be interesting to know how to make them hatch earlier.