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I have a Boox Palma 2 - their cellphone-sized thing that doesn’t have a cellular radio. I love it. They’re more expensive than kindles, though, since they’re not subsidizing their cost with ebook sales. I haven’t actually tried jailbreaking a kindle so I can’t say how good an experience that would be, but you could probably pick up a kindle of some description on the used market for dirt cheap to try it out.
100% this