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With enough dedication you can program an arm chip or an ESP32 (dual core 32bits 100MHz) < 10$ a piece.

eInk displays are also below 10$ but except for very recent and/or expensive models the refresh rate is not appropriate (unbearable IMO)

It's always the software that is the problem however.

Not sure I like eInk displays at all.

I like minimalism, a few shades of gray and one color (maybe two) could be enough for calcing. And the consumption too.. but the delay is too much.