Good fortune! I love those things. I buy up a single or a set whenever I can. Living in an agriculture based valley, I do still see these around. Not in junk yards though, those days are gone.
My best luck has always been finding a truck parked somewhere and locating the owner. If its been parked for a long time most people will sell them to you for a low price. Not really knowing their true value, and seeing them as a non-integral part of the truck, I've had luck getting them for a pretty good price.
Crazy how hard they are to find now, even on Ebay.
