Directions to Sun Valley junkyards, other junkyards in Socal

[SadbutTrue]

I'm back in socal for a month, and figure its a good time to pick up my 9 inch posi rear...

So... any guys in Socal have the directions to any or all of the Sun Valley junkyards (I heard there are at least 3 really, really big ones)? If not them, any other good ones?

Thanks!

PS: Any tips for getting deals and finding the stuff I need? I've never seriously been to a junkyard before...