They tend to slow down their eating habits as they grow into adulthood. i think its pretty normal. My male panther would eat only every couple of days sometimes and only a few large crickets when he did.
i dont recommend feeding dead feeder just cuz they get pretty icky. but invest in a little 5 gallon tank and house a few dozen crickets at a time with egg crates and fresh fruits and veggies for them to eat and they should last weeks until you can feed them off to your cham.:)