I sold a non worker ( failed CPU board) for $300.. bought it for $250.
Working it sold for $850 or thereabouts on Ebay.
Tony Pinball Shed has tried to push the costs of a Zac up to $1400+ which is really top end price for one, but id expect BG animation ( Magic Castle Devil riders etc) for that.
Farfalla is a stunning game to look at... but my goodness at that price!!!