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In my mind, I'm picturing a hard card with front cover pic and any pertinent info, bar-coded to take up to the cashier. So if the card is there, the ebook is available. Or a sticker on the actual book saying "this book is available in ebook format". Or a slip attached to the shelf that you pull out of an envelope to take up to the cashier, like they do in some stores, when the item is too big to stock on the shelf anything more than the display model.
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