I was surprised to find that my painter had a full mixing rig that was able to combine pigments, solvents and additives. They also had a wall of paint chips. They were able to come very close to my sample using the chips. They would spray what they call a lollipop with the chip's code and then adjust the color by adding the correct pigment. I was amazed.
My secret to finding a good and inexpensive body shop is to travel away from the city and find a smaller population area that has some poor folk up in it. Operating costs are lower in the sticks and the clients generally poorer. Then you ask around. Turns out everyone knows the best and second best body shop in the area.
I priced my paint application in New Orleans, Louisiana and outside - Luling, Louisiana - half price. Plus the guys out in the country really appreciated the business.