I would've bought that machine for $500 but I'm in Ontario. Since the USA made it a requirement to have a passport to cross the border, I haven't been to the states. Passports aren't cheap and they aren't easy to get around my area so I never bothered. It's about a 6 hour drive each way for me but it's worth it for a good machine.
Oh well, sucks to be me eh. Good luck with your sale.
btw, I saw a wg6100 monitor sell on eBay last week for $675 by itself. Working Tempest board sets usually go for over $120. Add to that all of the other components needed to complete the machine and well, $500 is practically giving the thing away. A classic color vector game like this should've sold itself within minutes or hours. I don't understand why someone hasn't snapped it up.
Bill B.