e-Books with Cards
See explanation below
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Visual solution

What is the core principle of your idea?

Let people collect!

Can your idea be applied to different formats (in a bookstore, at a trade fair, at a conference)?

Of course

Would it be possible to turn your idea into a reality, or at least create a prototype of it, at short notice, i.e. by the Frankfurt Book Fair in October 2014?

Yes

What do you estimate the costs for the prototype or the final implementation of your idea to be?

Not sure, but not expensive.