You need to work with a pro lab.

Then you calibrate your monitor, download his profile, soft proof to the profile, then send the file and tell them to print with no corrections. A pro lab will have a process in control so that when you both work to the same standard, the prints come out exactly as you saw on your screen.

MPIX is one lab. I use Prints are not 15 cents, but you get what you pay for. Forgot, Ai needs the file sent to them in RGb, not sRG.

I have no faith in the local processor run by high school students or retail clerks.