[harpastum]

If you're comfortable with microcontrollers (esp32/arduino), I can definitely recommend Inkplate. I found them when I was making a similar setup for my parents, and they have various sizes up to 10" and up to 6 colors they can display.

You can either just get the module, or buy with a battery and mountable case already attached. I think all of the models are also available via Digikey and Mouser if people don't trust random websites.

https://soldered.com/categories/inkplate/

[bravura]

I've never used esp32/arduino. How does it compare writing some low key Python on RPi and blitting an image to the display?

[xyx0826]

With an ESP32 or comparable (RPi Pico W, for example) you get MicroPython or CircuitPython support! That means a Python interpreter, drivers for popular peripherals and usually a network stack. Performance doesn’t beat a native SDK but Python is Python.