One way to find a good hair salon is to ask a number of people for their recommendations. List all the names you get, then take a closer look and note which ones were mentioned the most often. Those are the hair salons you should focus on more closely.
When selecting a hair salon, you should take a number of factors into account, not the least of which is their prices. Also important are location, hours of operation, general ambience, the experience-level of their stylists, and the range of services the offer.