As far as cost, it depends on functionality. If it's a slow typical ebook reader, I wouldn't want to pay more than $100usd for it, regardless of touch screen or wifi or other features.
If it's a fast epaper reader with a good screen and decent software/firmware, maybe $250-400. I can't think of anything on the market that manages both "fast" and "e-paper" yet. A good, small capacitive touch Mirasol reader with the Sony Touch Edition chassis design would be in this range (lower half) probably. For E-Ink, it'd have to be the fastest/brightest b&w they've demonstrated (not the typical current-gen Vizplex stuff), and the software would need to be pretty polished, and the reader software would need good H&J and font support.
I'd drop $600 for a Pixel Qi iPad-like device (and might do so if NotionInk actually comes up with their product)
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