you can go to the FEGA , "Firearms Engraving Guild of America " and look and see if they have a member in your area
OR you make a post one of the main engraving forums like Steve Lindsay’s engraving forum http://www.engravingforum.com/forumdisplay.php?f=2
There used to be a gentleman over in the Walnut Creek area who does/ did engraving. If I recall, his last name is Rice. If you go to the Vallejo gun show, there used to be an engraver on site at the show.