Dubia Blaptica!!! Much easier to breed than crickets and dont make any noise. They live for a couple of years, are live bearing, don't climb smooth surfaces, and are a good swap for crickets. One of the drawback is that they run to the first shadow and stop so it may take a few attempts to get your chams used to eating them but putting them on the top screen so they crawl across over their head is almost always successful. Gutloading and feeding is pretty much the same a crickets but you must provide heat for them to breed.
I still feed crickets, supers, horns, silks, bluebottles and WC grasshoppers. But my dubia colonies are always there for feeding month old panthers and all the adults. Its a good investment when you have many reps to care for. Our beardy loves them as well and can eat full grown dubia easily.
If you are still set on breeding crickets, start with around 500 full size (5 week) crickets. You must have heat on the bottom, put wet eco earth in an empty butter tub placed on the bottom of the cricket bin and cover it with an piece of egg crate. Take the tub out after 2 days and put it in its own tub over some heat and keep the eco earth moist by spraying it everyday (dont soak it) Depending on how warm you keep the butter tub and if you dont let the eggs dry out you will have a tub encrusted with thousands of pinheads in about a week. You can repeat this and have several tubs of eco earth loaded with eggs until you feed off the first adult 500 (or they all die, whichever comes first)
Hope this helps