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350 euros for 6 inch? 450 for 9 inch‽‽

Just buy some very cheaply-available electronic price tags [1] and use open-source firmware[2] which supports greyscale + yellow. Save literally HUNDREDS of dollars/euros/etc. For extra credit, they are not only black and white eInk screens, they are BWY, so they can add a splash of yellow!

[1] https://www.ebay.com/sch/i.html?LH_Auction=0&_nkw=Chroma74

[2] http://dmitry.gr/?r=05.Projects&proj=29.%20eInk%20Price%20Ta...

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Very interesting. Do you know of even bigger price tag models to search for? Is it as easy as the second page makes it seem?

And, separate question, but I tried just scanning [2] and I'm having trouble understanding how to determine the resolution of the tags in [1].

640x384 for those

it is that easy - i wrote that article

bigger ones are rare but do exist

If you just want to display information, I agree. Black/White & red/yellow is enough. But if you want to display a photo, you need gray shades.

Read that article... greys are working just fine...

I know that most people assume that BWY and BWR screens cannot do greys, but that is wrong

Wow. Impressive research and write-up.

"Getting working greyscale turned out to be very very hard. "

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