Here is a Black Hole back box spinning disc that I picked up a few years ago and doubt there will be any floating around. This was a NOS that I got but the white has lifted in a few areas so would only need a minor restore for a game, or drill out the centre hole and make a clock or just store it or hang it - one of those rare pieces that is a cool bit of art.

Photo - Sell4a & b
$45.00
NOS Black Hole Backbox Spinning Disc

sorry, hard one to photo graph well.