Do you mean a reader that will enable you to easily buy the book directly from the device? Because it's easy to sideload books from wherever you want onto all of those devices. None of them chain you to any one store. The newest Kobo also allows you to borrow library books directly from the device, if you are so inclined and your library uses Overdrive.
Sideloading (including DRM stripping) also means you have a the books you own, for when the original bookstore goes away.
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