I just paid about $38 (shipped) for a power car and a dummy, both in original boxes, although not in tip top shape. It runs, navigates the curves and turnouts of the Retro Rig, and is a bit more gravely sounding than the first power car I got for $15... But the shells are good, the pans are there, and the paint is actually a little more crisp than I've seen (still murky, but looks like the pad might have been freshly inked when these were done). So now the fleet stands at 2 PC power cars, 3 pc trailers, and 1 Amtrak trailer. (The Amtrak shell came on the first power car, and was pretty abused. I think I can patch it up and repaint it to match the PC cars... Microscale makes the striping for the nose cone...
I need to find two more of the moveable pans, really just the top section, to bring them the rest of the way around.
I'm going to work on tidying them up, for all intents and purposes, they'll be my equivalent of a Lionel set, running a noisy loop.