Swimming articles in San Francisco

Hello everyone. We have a lot of sport stores in Mexico city but only one that I know is specialized on swimming, even so they do not provide graduated swimiming googles. I can find graduated goggle on optical stores but they are too big and too expensive. As I am going to the Words next August, can anyone tell me of a store in the Bay area where I can find and order a graduated cool and small goggles (Swedish type) for my swimming? Thanks in advance.:cool: