Yup. There's a Mountain Music System, lightpen version but with cards only. As of this posting on 4/28 it is at $50, but I would hope it goes a lot higher. I haven't priced or looked at these in recent times. So I don't know what they're worth. This is NOT my auction, nor am I affiliated.
http://www.ebay.com/itm/142361651300?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT