mechanism is simple but effective! Customer will be curious to discover new titles.
I highlighted the digital publishing products in physical space. So my proposal is a special shelf which has a rotating strip (with e reader on it). The potential customer will have the opportunity to choose books and will extract them from the screen. Also can rotate the tape to create the impression that through an eReader has unlimited possibilities. The books could be covers (with direct link, qr code etc. on it) or real books with a sticker on it (with direct link, qr code etc. on it).