The Capo Modell Campagnolo was only $20 at a yard sale. Having owned one previously, I knew what they were. It lacked the original Record hubs and cottered cranks, and the Gran Sport front derailleur had worn out, but it had a nice set of Nervar Star cranks and original gear levers and brakes. Since the frame was undamaged, it was a no-brainer at that price.

Capo Sieger -- this was a lot more of a splurge, but it was almost 100% original, and I knew it was the rare top-of-the-line model. I have since seen two in crummier and less complete condition sell for $2K and up on eBay, so no regrets on that one, either.