Where to buy a flat cage in Germany?

Im new to the chastity thing, I live with my parents in Bavaria, Germany, I recently got some money and would like to purchase a flat cage, since i found those most interesting. But im quite stuck now, since i don't know from which website to purchase. Could i request some assistance here? Maybe some tips as well how to be discreet when the dark falls? My mom knows about my thing for latex and that's already too much knowledge for my poor mother.