I use Paul Bos for all my heat treating and he is just great. You can give me a call or an email, 770-449-7809 or knives@mediaone.net
Zog gave you his number. His address to ship blades to is Paul Bos Heat Treating, 1900 Weld Blvd., El Cajon, CA 92020. The great thing about Paul is he uses atmospherically controlled ovens so the blades are clean with no decarburization at all. Also he cryo quenches after hardening and before drawing the temper, which provides better austentite conversion and finer grain development in the steel. Most heat treaters cryo treat after tempering. Also Paul is great about straightening out warps. My fine tangs warp a lot and they all come back straight as an arrow.
I used to do my own heat treating; I never will again. Paul's prices are $12/blade in one's or two's, or $60 for up to 20 blades if you do a bunch. He really is set up for large scale work, but does one-offs if necessary.
He's good, and one of the few I give unqualified refernces for. Good luck.
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Jerry Hossom
knifemaker