I am doing the same sort of search for a Bi-Polar. I keep missing the semi-damaged examples at around $250, and of course can buy them all day long at $425.
So if you have one with scratched paint, broken castings, burnt-up electronics, etc., for cheap, let me know. Sure, I can afford the $425 variety, but I want to 2-rail it, so am waiting for less than perfect. It is, indeed, the search.