>>I did come across an old supply house in San Diego once (est. 1932) that had some old-new stock, still in the boxes from the likes of Rodale, Sierra, H&H, Paulding, Slater, Lew fittings and of all things, FPE! <<

San Diego Electric Supply down on University in the college area perhaps? I did a service call down there (lots of 50's/60's vintage houses down there..) on a house with an old touch plate system in it and I went there to get some parts.. great place.. but some of their stock looks like it came from an antique shop. Great parts source for fixin' those old houses though.