Membership in this society is by invitation only and the members of this society devote their practices to cosmetic surgical procedures. Most are also members of the American Society of Plastic Surgeons and are board certified in Plastic Surgery.
Then, you should think about calling around to doctors that have worked on your friends and family. See who comes recommended, and then go in for a consultation. At that point you can consider the costs. There is usually a big variation in fees, so expect a wide range.
Another good rule of thumb is to understand that these procedures cost more in certain parts of the country than in others. For instance, in areas like California and New York, you might pay anywhere from $7000 to $12000 for breast implants, but in somewhat less populated areas where the cost of living is lower, you would normally see fees for a saline breast augmentation around $4000 to $5000.
Good luck. There are a ton of great plastic surgeons in your area!