I don't know if this has already been covered, but I was searching eBay and saw this ad for a NIB Mystery Castle by Alvin G. It's currently in Germany, however, and lists for $13,500 as a 'buy it now' item. Sorry if this topic has already been covered!
ebay.com link: PINBALL ALVIN G MYSTERY CASTLE SERIAL NUMBER 3564 BRAND NEW NIB