Their website is broken for a while. I hope they know and fix it one of these days. It is located at 12250 South Saratoga-Sunnyvale Road Saratoga, CA 95070 408.873.0188 It is not very easy to find. The store is like a little old house, so look carefully. But they have lots of selection, so it is worth the trip.
It's DEFINITELY worth the trip. Now they have a Bigish red sign that says Racket Supply on it. Its still kind of hard to find but the sign does help alot for the first timers. Its inbetween the Quiznos and Railroad Crossing, since the address isn't clearly marked
going north on 85 from 17, exit deanza blvd, make a left onto deanza. it's about a mile in on your left, but as others have said, it's not easy to see... i've been there a handful of times already and still miss it.