does such an eReader exist from a manufacturer with as much market share as, say, B&N has in the US?
(limiting eReader to devices with an eInk screen here)
If you include tablets, obviously, there are iPad Pros (iPads Pro?) with 1 TB of storage. Or Android devices with MicroSD slots and/or at least 128 GB of storage. But once you get a less crippled OS with more app support you can have an app with a solution purpose-built for that sort of thing
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