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You can find waveshare panels that are bigger, 13.3" for around the price of that thing. They are not that hard to drive.

While what could well be the panel used in this is cheaper[1], there's obviously consideration due regarding whatever device is driving the panel, making the frame/mount, and coding the software to drive it, etc.

You may be able to get a larger panel for the same sort of price[2], but there's something to be said for having a finished product that's fundamentally plug-and-play... which is arguably a different market to a "buy the components and make one yourself" crowd.

[1] https://www.waveshare.com/product/displays/e-paper/7.5inch-e...

[2] https://www.waveshare.com/product/displays/e-paper/13.3inch-...

The best displays seem to be reserved for ebook vendors. I’m using a boox device with a PWA (webpage that works as an app).

I have a similar thing running using a Zero WH and Inkycal. The screen I have is the same size (7.5 inches) but you can use bigger ones too. I didn’t want to shell out more money initially for a larger screen, but I may upgrade it later.

Seems like this is/was meant to be a door placard for meeting room availability.