The only place I discovered Poly-Plays (a whole wall full though) was at the hotel "Red October" in Zinnowitz on Usedom island (popular vacation place back then and today). We spent our holidays in Zinnowitz for a few years, and I sneaked through a backdoor into the hotel in the early evenings to play a few rounds as often as I could. The games were quite crappy though compared to Western arcade machines.
