Doubt you'll find any in the area. Best best is to find a builder that has cores. (By the time you buy a set and ship them, it's probably cheaper).

I believe SD has different cores and people that have used their services love them. Not only do they produce good flow numbers, but maintain high port velocity.
http://www.sdperformance.com/listProducts.php?categoryID=5
They are also one of the few (if not possibly the only) that can CNC port a Pontiac head.