I have 80 of these puppies spanning '76-84. It used to be a hobby of mine. I haven't bought one in over two years. It's a neat hobby because these things have a definate start year ( 1976 with Mattel's Auto Race, the first fully electronic game ), so it is easy to collect. Most of these are purchased from ebay. Handheldmuseum is a great site for more info on these fun games from the past.