I just bought an InkPlate. It's a recycled Kindle display on a board with an Arduino, Wifi, SD slot, and even a couple of capacitive touch spots on the board for interaction. Can be programmed in C or MicroPython, or switched into "peripheral mode" (I might have gotten that name wrong) and glommed onto a Pi or whatever.

It's very cool, about $100. https://inkplate.io