Sometimes it pays to get up early.

A couple of years ago, someone asked me a question about the Mopar 6-1 slant six headers. I couldn't recall the answer, so "googled" them. A for sale unit popped up at a speed shop, for $125. Called to verify they were available at that price, and got them heading my way.
Another time searching for NOS slant six rocker arms, found a complete "Direct Connection" hydraulic to solid valve train conversion kit. I didn't even know such a thing existed. Got it for about half the going price of a set of rockers.