I buy most of my feeders from www.reptilefood.com their prices are the cheapest of all...Here are some of their prices:
Crickets (Pinhead to Adult): $10.50 for 1,000.... $9.50 for 500... $8.50 for 250
Superworms (Small, Medium, Large): $17.00 for 1,000
Mealworms: There is a national shortage at the moment and i can't remember the exact price, but i think that it was $6.00 for 1,000.. They had mealies ranging in size from 1/4" to full grown. When they were in stock you could choose the size of mealies that you wanted.
Waxworms: $11.00 for 250
they also sell feeder supplies for crickets and your worms (worm bedding, cricket water, cricket food, etc). Also have nightcrawlers, red worms, fruit flies, and some other stuff, but i cant remember their prices
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They are an excellent site and i have had absolutly no problem with them at all. their customer service is the best around, they even have a cool Instant Messenger thing that you can use to talk with them about their insects, caring for them, reptile/amphibian talk, and info about their company and its policies (shipping and refunds on DOAs)
HOPE THIS HELPS