Cheapest solution would be to buy a used Kobo ereader and slap https://koreader.rocks on it.
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Here to plug the boox ereaders. The neat part is they’re essentially android tablets with e-ink screens, so there’s not as much lock-in and of course there’s epub support. Their color e-ink is also super-cool tech
I'll second the boox line of products. No need to go for the color e ink either for it to be very functional as an android tablet. I'd love to have a color one at some point, but I'm happy enough with the basic one and it's lasted me quite a while.
If you get one with the pen it is quite nice for note taking as well.
That being said, if you just want to read e books, it's not the cheapest option.
I use Kobo ones, I had a Touch years ago and currently use a Clara HD, the software isn't too fast (though maybe that's different on newer models) but has always been pretty reliable for me, even on the Touch despite its age
Something I like is that it's integrated with Pocket (the Mozilla-owned service) and can automatically sync articles you add to your list to the e-reader
If you find your kobo ereader sloe you can install koreader on it. Koreader is much more snappy than the stock interface.
Anything that can run koreader without jumping through too many hoops is a fine choice. I hear good things about Boox but I haven't been able to afford one yet. Note Air 3 C is a good bet especially if you like to read comics or pdfs.
Three months ago on Hexbear: What’s the right way to do e-readers in this year of our lord 2024
Ty, my searches weren’t drawing up much.