Today, on tweedehands.be, a Powerplay box…contacted the seller but the games and joystick are missing. It’s only the box and the C64c itself. I guess that is the difference between 50 and 150 euro or even more. Seller is moving out of his house, his kids are over 40 now and left along time ago. He found this unit when clearing his house.
This set was released in 1990 on the German market, and it is rather rare if you can get your hands on a complete set. Decided not to buy this box, because in the end it will probably quit impossible to get the set complete, which is a shame.
The set is well documented on Retroport.