SN10220 was recently on sale on eBay.

The original owner bought it at a local auction even though it was not functional. In his own words, he "just thought it looked cool." Apparantly the TV works, as you can see in the bottom picture the tubes do glow, however the owner did not mention if it had any sound. My guess is the circuit boards need some work. The machine has definitely seen better days as the cabinet is pretty badly scratched up. However, the unit did successfully sell for $251.50 on eBay so obviously even a Computer Space in rough shape has some inherent value.