Best of all, today (Friday) is free shipping Friday! Silkwormfarm.com is the best as far as I am concerned. Silks aren't cheap, but you can order from them in bulk too.
We feed our adult bearded dragons a few large silks every other day. An adults daily diet should be at least 75% vegetarian. 
As for Chameleons, ours eats several every day. We also offer him other live foods, but he seems to prefer the silks. Imagine that! Silks are a wonderful feeder for chams.
Good luck with getting your first shipment of silks. Just remember to wash your hands well before handing the silks. They are very suseptable to bacteria.
Hugs,
Veronica
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Beautiful Dragons
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Signature file edited; [phw 8/31/04]