I get my kydex at knifekits.com. They have decent prices, but fast shipping. I have ordered some stuff from texasknife.com as well, but that was recently. They have about the same prices, but you have to specify how you want to material cut.

There are quite a few places to order it. These are just the places that were suggested to me.

Garrett
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On occasion of every accident that befalls you, remember to turn to yourself and inquire what power you have for turning it to use. - Epictetus