I've been seeing Eink displays get more and more commercial use over the last few years. A lot of the grocery/department stores have replaced printed out paper prices on the shelves with Eink ones. The modules are pretty cool too, it looks like the display is updated via NFC/RFID and the display itself doesn't have any sort of power source. It gets electricity wirelessly whenever it needs to be updated.

Edit: actually most of the eink price tags use a button cell battery, oops