Be creative with which sources you use to find these repair shops and mechanics. You are the Web Research Expert. As an example, you can search the yellowpages.com for "Car Repair & Service" near Los Angeles, CA or Anaheim, CA, then call different shops with 5-star ratings, 4.5-star ratings, & 4-star ratings, and find out how much they charge and generate a custom price.
... Look at a map on the internet to see where these county boundary lines exist, so you can know which cities are in there, so you can know where you can research.
Try lots of different cities to get an idea of which ones are going to provide the lowest prices with consistently great quality & speed.