Most I see for sale are in supply shops, like Tandy and the local saddle shop, posted on a pinboard on the wall, with the "take a number" on the bottom. Quite a few are on modern tables, with modern clutch motors, but occasionally you run across one on the original stand, to me that's a bonus, to others, maybe not, especially if you have to transport it
I know of 3 currently within a 4 hour driving radius, 2 on original stands, another on a modern stand, we already have one, but I keep an eye out, 2 is always better than one right?
I collect the machines, my wife uses them, so to me, I'd rather buy one that was being used up to the day I buy it, so I know its history. You should let your buddy have it for a reasonable fee if he's going to get it up and running, and has some of your grandfather's old tools already, sounds like a great way to let the legacy live on.