The two that I can think of in the LA area are http://www.docskihaus.com/
or if you want to trek to SD, you can check out Ranch Craft Ski shop (no website).
Dont have any personal experience with either of the LA area shops, but I think someone on the forum (Chris D maybe?) was at one of these in the recent past and can give more insight. Hope this helps.
"I know you can fight, it's our wits that make us men."