When I was in LA area about two years ago I found a place called Pacific Coast Import Parts that had good prices for stock items, brakes pads, rotors, mastercylinders, and other stock items. They only have a few shelves in the front but you call them order what you want and they seem to have it there in a day or two. They are located on 837 Pacific Coast Highway, Hermosa Beach Ca 90254, and there number is 310-374-8933. One thing I noticed on the receipt is a 20% restocking fee so make sure you buy what you want. You can also set up an account and they gave a discount back then, if I remember correct it was like 5 or 10%.
I guess they're online now at: