My Ford dealer charged me $2,300 for all 3 belts, water pump, gaskets, overflow bottle (leaked after 9yrs) to be fitted. Don't know why, but my gas mileage has got a little better since having this done. Now hovering around 25mpg compared to 23.9 before I had it done. Coincidence? I don't know.
Forgot to add that I bought all the parts elsewhere and the mechanic found the overflow bottle leak and replaced it. I did all this at 107,000 rather than wait until 150,000.