I never knew these thins existed. Saw one at work last Friday packed away in a closet. The person I was with said it came out in like 2007 and cost around 10k. The picture below is the only one I could find.
My buddy said his dad got a hold of one for his rec room or something. No idea how much he paid, though. It's pretty crazy how big of a turn the surface took. I think once iPad was revealed they probably scrapped the original design and intent.