I haven't visited many bike salvage yards but I have visited few.
And every one of them sucked.
Piles and piles of old junk, priced at ridiculously high.
Search Ebay (don't forget overseas Ebay sites) and if that doesn't work then just try to find a source that sells new parts at best possible discount.
"It is not when or how you die but how and if you truly were ever alive!" Dr. Jerri Nielsen FitzGerald