You also get advice, help, and support with problem animals. You can purchase animals and know who they come from, and often you get a better price, somewhere between wholesale and retail. There are many clubs, and the list changes a lot. I don't have time to maintain such a list. There is a club list posted periodically on rec.pets.herp.
Clubs often advertise through stores.
Go to a reptiles show or expo. If they are not put on by the local club in the first place, the clubs will often advertise. More and more of them have their own web sites.