From the Gym index on StartingStrength.com:
Starting Strength Gyms are the best places to train in the United States. Managed by Starting Strength Coaches who have been evaluated for their expertise in instruction and their understanding of the Starting Strength method, a Starting Strength Gym affiliation is your assurance of a quality training experience, whether you join as a member or are just in the area for the week. Expert coaching, the finest equipment, and a helpful attitude toward your training goals are all part of the experience at a Starting Strength Gym.
These gyms are centered around solid strength training and are places where you can train without making do when you are travelling or moving to a new location. Don’t overlook this resource!