Ethan Dicks wrote:
  The two most common expensive machines I've seen
are Ms PacMan
 and Galaga.  I routinely see them go for $600-$1000 US, auction after
 auction.  
Hmm, I stumbled across an unplugged Ms PacMan cabinet the other day in a
nearby hotel and had a half-thought to go and ask them if they actually wanted
the thing any more (more for the chance to poke around the insides than
actually play the thing). Maybe I will go back there...
  Space Invaders is in the same league as those
machines, but is not as common
 anymore (if it ever was). 
Think I said it on here the other day (it was certainly to someone!) that I
passed up a free cocktail cab space invaders many years ago - I think that's
one of my biggest classic computing 'regrets' :-(
cheers
Jules