Boox makes a portable 13" e-ink monitor but it's tough to swallow at $800 https://shop.boox.com/products/mira https://shop.boox.com/products/mira e-ink prices

Boox makes a portable 13" e-ink monitor but it's tough to swallow at $800 https://shop.boox.com/products/mira https://shop.boox.com/products/mira e-ink prices still shoot into the stratosphere if you want anything larger than 10"