coastalsilkworm is the best place to order large quanity. and my suggestion would be to have a large mulberry tree nearby for food. the food they sell but it stink compared to the real stuff and it really stinks mixing the stuff together
Go to this site -www.chameleonnews.com , once there pick past issues, and select Februrary of 2005 issue. There is an article about silkworms that tells you pretty much anything you need to know.
Mulberry farms is also another vender. I think Coastal's advertising is bogus. Personally, you should charge by size, it cost more to raise them longer. He doesn't charge by size because he only sells them as 1/4 - 1.5inch. That is small or medium by MF standards. I have ordered from both and prefer MF by a longshot. They also provide several other types of feeder insects.