I bought from the online auction, but haven't received yet, a Research Concepts 1000A also known as RC1K. It's a commercial rack mount dish mover so it's sort of big, but it looks really cool. There is a still some information for it on their website. This model is discontinued but they have a DOS program that can be downloaded to move the dish via the serial port, and the manual for it can also be downloaded.
There are some RC1K's on auction now, but the price is too high, if you ask me. (200) Mine was considerably less. There are also some of their newer models listed, for a whole lot more. They are definitely commercial units and are priced accordingly.
These RC1K's are really just a heavy duty, stand alone version of the dish movers found on the old receivers, except they can't be operated by a remote control. They have a schematic on their website, so somebody (not me) might be able to repair one when it fails. I don't know if it would be practical to do that with an old receiver, except 4DTV receivers maybe.
They wouldn't be for everybody but I think it's going to be pretty cool if it works, which it is supposed to, and it might be something to look for if someone was interested. Mine was only 10 dollars, so they shouldn't be selling for a whole lot. I doubt that any commercial users would want one. They're the ones getting rid of them.
The only market there is for one now days are these strange people who call themselves SatelliteGuys. They think there is still something to watch on the old obsolete C band, with a hideous looking big ugly dish or two, or more, in their yards.