I have yet to find a local salvage yard that has Porsches and is willing to give a reasonable deal. But that could be just my area and bad luck. Try ebay and the Porsche forums. I've gotten a few parts at good prices.
Try
http://www.rennlist.com/ads/ and
http://forums.pelicanparts.com/forum...p?s=&forumid=5
They have both been pretty good to me.