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If your board is an average design without micro vias, I can recommend Alltek - a small company in Irvine. They are honest, they'll work with you on price, and they do a good job. If you ask, they'll give you a tour of their facility - https://www.alltekcircuit.com/ .
One of the oldest companies in the area is Alphanetics in Santa Ana. Like Alltek, they can handle standard board technolgies. They do a lot of boards for commercial manufacturers. They're competative on price - https://www.alphanetics.com/