alt Hacker NewsThe Waveshare e-ink display he's using is $172.99.[0] The one that jgrahamc used in a sibling comment is about $200.[1]
It's a shame that it's not easier to pull the e-ink displays out of used e-readers because you can buy old Kindles on eBay for about $20-40. I know you can jailbreak them and achieve something similar to OP, but it'd be neat if you could just drop the vendor's e-reader firmware entirely and run your own software.
[0] https://www.waveshare.com/product/displays/e-paper/9.7inch-e...
[1] https://soldered.com/product/inkplate-10-9-7-e-paper-board-c...
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TRMNL https://usetrmnl.com/ is an e-ink display that offers many plugins, called ‘recipes’ — and you can build your own. price is ~ $150 and you can opt-in for a ‘jailbreak’ version, too. all open-source.
I have an old kindle I was keeping in a draw as I planned to do something similar as the OP when I had time.
I've done no research yet though, what's the problem of reusing a kindle screen? It's not like old displays where you can plug a ribbon into something else?
I recently saw that my local supermarket had replaced most of the paper price tags with eink displays. I guess they can be updated dynamically from head office. Seems like you can buy them now on ebay for not much per unit.
https://tinyurl.com/28v4f583
I wonder what their battery life is, and which wireless protocol they use.