This guy in NJ 3D prints these magnetic Mirror of Eriseds and paints them by hand. While it’s not actually a glass mirror, he said the “plastic mirror material” he uses is pretty reflective. They’re 7.5″ tall, and you can customize the color, if you like.
Please note, this is missing the iconic Mirror of Erised inscription, “erised stra ehru oyt ube cafru oyt on wohsi.”
Still neat and high quality, though.