A google of "Tai Chi Chuan, San Bernardino, CA" doesn't bring up too much.
One instructor jumps out though, which is to say that at least I've heard of him before. I don't know too much about him other than that I've heard his name mentioned a few times at seminars and tournaments.
Here's his myspace page link:http://www.myspace.com/hkurland
I hope this helps.