i bought 100 worms 5 years ago,..and have never had to buy more, theyre very easy to breed!!
takes a while for the baby worms to be visible,...every 2 weeks i dump more bran in with the beetles so they cant eat their eggs, after doing that 3 times i move the beetles to a fresh container and then start to see baby worms emerge everywhere,..
i only use superworms that are freshly shed, they have quite a bite on them and i find the amyae tend to swallow them pretty much whole,.....they are an absolute favourite with them and the beardies!!
i use greens and cat bikkies for food.
they also need heat to breed properly,..i keep mine at 30C.