Walmart is leading the charge to replace traditional paper price tags with electronic shelf labels (ESLs) by 2026. The retailer aims to introduce the technology in 2,300...
AFAIK, they use RFID now so they must be changed manually but maybe someday, they will devise a price-gouging scheme involving face detection and tracking people with security cameras.
"Here comes this lady that always buys four cans of dog food despite the last price increase! Let's notch it up it by another 20%!"
In the Czech Republic, BILLA uses them and they respond to the RFID reader on my phone. It's a different kind though, most have black-white-red displays.