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$140 – the Kobo Clara BW (black and white/e-ink) is clutch. Dark mode, plays well with calibre, a wide range of supported formats, and way more storage and battery life than you’ll ever need.
Edit: it is one of the first devices to utilize the E Ink Carta 1300 screen. It’s filled with e-books from Annas Archive loaded by Calibre on Debian and never complained about compatibility.
I left my Casio poolside in autumn and found it in spring. It was fine and on time. I’m still using it.