Depends on the environment. We sell retail, and I'd guarantee, cleaned up and shiny, that we'd be putting 12-1600$ price tag on it for retail sale....craigslist/facebook....sure 700-1k for a nice one...
The upright I believe is in the same price range for retail sale...although most arent super nice, as the art is either repro, or faded, and the monitors are burnt still (no screen saver...still after all these years....).....I was lucky enough to get a pcb for roughly 150$ not to long back....but the rest i've seen for sale all fell in the 2-250 range.
Hope any part of that helps.