but why? is it because of patents? Shouldn't this technology get cheaper with time?
https://news.ycombinator.com/item?id=26143779
Supposedly, a core patent for the technology expired a year ago:
https://old.reddit.com/r/eink/comments/1e3icaz/any_company_d...
It's probably too soon to easily tell whether that's enough to make e-ink screens cheaper and more available.
There are many tens of millions of e-Ink store shelf-edge price labels around, for example, and they're a cheap commodity item.