This unit sold on eBay for $760 on May 24, 2005
Not sure why, but at some stage of this machine's life it was converted to a Pong. Admittedly Pong was a much better game. The owner emailed me to advise that as conversions go, this is a very professional job, the new control panel fits perfectly and the internal parts are all proper Pong parts.
Perhaps an arcade owner felt the need to turn the lousy gameplay of Computer Space into something more profitable. This was definitely converted and not an empty cabinet Nutting Associates released as a Pong style game. Nutting never altered any of their Computer Spaces.
This unit also sold again on eBay for $750 on January 3rd, 2006.
UPDATE 2008: This machine has been somewhat restored to a proper Computer Space game again and was shown in early 2008 in Melbourne's Australian Centre for the Moving Image (ACMI) exhibit of Game On. UPDATE the ACMI were not the people running Game On, they were merely hosting it. Game On is organized by the Barbican Arts Center in London, England. See UPDATE 2012 for more info.
IGN did a story on the exhibit which can be read here. Click on the thumbnails at the bottom of this page to see a larger version of the restored unit.
UPDATE 2012: The machine is part of the Game On exhibition which is organised by the Barbican Arts Centre in London, England. ACMI in Melbourne Australia was one of the places it has been shown. It first shown at the second visit to the Museum of Science and Industry in Chicago in 2006 and has been shown in every venue in Game On 1 since then. The red unit now has a blue companion though neither unit work due to dead components. The good news is there is a Game On 2.0 being organized with a single player unit and a two player unit and both work although one had a dead monitor and the two player's monitor is beginning to decline.