This disc was designed in 1995 and is still manufactured and sold by DiscoveringtheWorld. You can still buy it and a lot of other discs from their online store. You can find a disc for everyone, also models that are hard to find in other shops.
And the list some rare and expensive collectors discs: http://www.dtworld.com/category_s/301.htm
For example an original flying saucer from around 1953 inclusive the package – see http://www.dtworld.com/product_p/c-pipco-flyin-saucer-o.htm for only 695 $.
I would like to own its a little bit out of my budget right now 🙂
You can find this disc online for example here: