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Quote:
Need to have:
Waterproof (for bathtub use)
Basic browser functionality (mainly Reddit text posts and comments, light articles)
Expandable storage, either a card slot or easily being able to open the back and swap an internal SD or micro SD card, or optionally 64GB+ storage not expandable
Easily sideload books in nearly any common format, probably mostly epub, maybe some mobi
Nice to have:
Physical buttons
Open / unlocked software and ecosystem, the more open the better
My budget is max $100 for a new or used reader, preferably closer to $50.
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IMO. your ideal reader doesn't exist at the price point you have specified. If that is a hard upper limit on the budget; I think you have to either give up the waterproof requirement, or the expandable storage requirement... or both...to find something under $100 U.S.
Basic browser and having epub and mobi supported are relatively easy to find (Kobo, Pocketbook)