[whynotminot]

I would guess there's not enough volume due to limited use-cases of the tech compared to more traditional screens.

The typical e-ink uses cases boil down to e-readers, dumb-phones, and hobbyists, which is not a huge market. Anything niche or specialized tends to carry a higher cost.

[shellfishgene]

There are probably billions of e-ink price tags in supermarkets around the world, but I guess scaling it up is not easy?