In early March we conducted a 10 day trip to Seoul, to attend the OLED Korea 2019 conference (and a visit to some local display companies). One thing that we noticed during our trip is the adoption of E Ink shelf labels in stores.
We have seen E Ink ESL displays in Samsung retail stores (used to detail the new Galaxy S10 flexible OLED smartphone family), and in supermarkets across town. The ESL displays were used to display price and information (unfortunatly always in Korean) - and were nicely placed.