$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.