seachaz - I went to a GSAS meeting for the first time in March and just last weekend to the big auction and alfalfa is right a great group of friendly people. I even took my father-in-law as a guest to listen to Dick Au speak and he loved it!
Anyway I was looking for rocks too at on point and found some great ones at The Fish Store but I think there are even better options at Midway Pets. Someone on Airstone the GSAS email/blog posted some pictures from Midway Pets and they had at least three boxes of different kinds of Japanesse Style rocks...so give them a call and they can tell you exactly what they have.
Here are the pics the member posted: