I'm a small time maker in San Diego, CA but ship my stuff all the way across the country to Peter's Heat Treat. I'd call or email them to get specifics and quoted info from them but this is what I've experience with them.
http://www.petersheattreat.com/ - The customer service is GREAT and turn around time is reasonable.
1 blade is $25 each
if you do multiples you'll pay the per blade price up to a batch quantity.
Batches are up to 20 pieces and cost $110
so if you're doing 1-4 blades you'll pay $25 each but more than that you'll start saving money as your quantities go up to 20 blades. More than that, I can't attest to.
They do great work and I've never had a problem with them on the batches of 440c I've gotten back and they have all been great.
NOTE: You will have additional shipping costs for the return shipping to you. I package my stuff in the USPS flat rate boxes as going cross country is costly. I tape the crap out of them too just to make sure the box doesn't get damaged and I lose anything.
I've been talking with Certified Metal Craft in San Diego here. They used to do a lot of work with Buck and some others I know that are local veterans in the knife community have recommended them as well. They have the capability of doing higher quantity batches at a reasonable price but at this point, Peters Heat Treat is cheaper for me (even with shipping).
Hope this helps.