That's very much bigger than a book, so I think that's probably why it's harder to replace. There are still large format paper devices. Kobo Elipsa 2E for $350

That's very much bigger than a book, so I think that's probably why it's harder to replace. There are still large format paper devices. Kobo Elipsa 2E for $350, Remarkable 2 for a touch more, etc etc. They're not sold as ebook readers, but you can read books on them fine.