PRS-505 as mentioned before, PRS-300, and PRS-600. Kobo. Ectaco. The Hanvon readers. Hanlin ones (Astak EZReader, BEBook, etc).
Also, the important thing is to make sure you use something like Calibre, and not the official ebook manager, and avoid DRM'ed books (or at least strip the DRM if it is possible where you live).
All the ebooks I've mentioned are not wireless, but some have official apps that may hide something that will delete the books when you sync the reader. If you avoid using their apps, they can't do any tricks.
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