“My bathroom mirror is smarter than yours”→

Max Braun:

Sometime late last year I realized that I wanted my ordinary bathroom mirror to be more like the future we were promised in the movies.
There doesn’t seem to be anyone selling the product I was looking for. The individual parts, however, were fairly easy to get. A number of people have done similar custom builds recently, but I had something different in mind.
So I ordered myself a two-way mirror, a display panel and controller board, plus a bunch of components and arts & crafts supplies.

Okay, but why doesn’t anybody sell these ready-made? Clearly it’s not too hard to do, and it’s a nice addition to a home.