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Greg Neufeldleft a comment
This is cool but only if it's near-free and crowdsourced. If you make this a give to get product, where members have to mail random books to other people in order to stay a member then I think it would work. I would sign up. But I don't think 4 is the right number, maybe 2 or 3.
4 Random Used Books in a BoxGet 4 awesome random books delivered to your door monthly.