Never buy prey again!
You can start your own colonies of prey and will never have to buy them again. The only problem is you have to maintain them and keep them clean. This is not a problem if you get into a routine. The crickets can be nosy. But it is worth the expense you save.
Crickets-
I started my own colony with these instructions and they are thriving.Warning: Crickets may be noisy so think where you will put the colony tank. It should be in a warm area but it doesn’t need to be heated.
Mealworms and king Mealworms-
They are vary easy to breed but it takes patience. You get a small 2-gallon container form the local pet store. Then you put all the mealworms into it. Add oranges or potatoes on the top. I would add a piece of egg carton in the top for the beetles. The larva turns into beetles and lay eggs and then you get more mealworms. Be careful not to take too many mealworms or you will exhaust the colony supply. Add corn meal every week for there food. Change the orange or potato so it doesn't start to mold and kill off your colony.Wax worms-
Are a fatty source of food. I would not recommend this to be the staple food source but as a treat or for pregnant Dragons. You do the same thing as mealworms except the larva spin a cocoon and turn into moths so you need a closed container.