if you have alot of chickens. Armostrong chicken farms is the place to buy crickets. You can get 1000 for about $20. Also you can get meal worms at a good price, and you can grow the meal worms yourself after you take a handful and throw them in a tank.
Meal worms are rediculously easy to grow.
I buy mine from Armstrong crickets in bulk if I don't want to grow em. 1-800-658-3408 they are super friendly and quick. Jeff is the owner. he is a great guy. tell them Jason from J's jungle sent you there so he knows I am still helping him out lol!!!!
But once you have some fill a 10 gallon fish tank ($10 at any petstore or possibly free in the local paper) 1/2 full of instant oatmeal, cornmeal, and cream of wheat.
Put a handful of worms and a large potato cut in 1/2 in the tank.
Place a cover of some type on top of the tank. keep in a decently warm/cool space.
the worms will grow and molt into beetles of 2 different colors. then they will begin to breed like crazy.
in a few weeks you will have more worms than you know what to do with! GOOD LUCK!!!!!!!!!!!!!
Hope this helped!