I don't know any in your area. And I don't know how the following labs are for film negatives, but they rock for transparency scans. They are also only mildly expensive:
Chrome in San Diego: http://chromedigital.com/index.html
DCC Photo just outside of Philadelphia: http://www.dccphoto.com/
If you want to get serious, I can give you the name of a gentleman who produces some of the best transparency drum scans I've ever seen. Back in the day he used to print B&W for the likes of Robert Mapplethorpe and Joel-Peter Witkin. He's going to be more expensive than the above places, but he's absolutely top notch.