Yep, there are some Chinese manufacturers making them; I occasionally see information popping up on them on e-reader devices news websites. As you can see though, still not cheap.

Here are some of the larger e-ink displays.[1] No prices given. They're being pitched to cities as bus stop displays, because they can be run from a small solar panel. It might make sense for that, because having power run to a bus stop sign probably costs more than an expensive E-ink panel.

I notice that some Alibaba sellers of similar displays copied some of their images from that site.

[1] https://www.smartcity-displays.com/large-format-e-ink-displa...

You still need the bus data sign illuminated at night, and bus stops have plenty of room on top of the shelter for a larger solar panel.

Boston's got some of the solar-powered ones, I've seen them late 2022: https://blog.eink.com/bostons-ink

Looks like they were also using them for transit at one point, but I haven't seen these myself: https://www.mbta.com/projects/solar-powered-e-ink-signs