Old fashioned bookcases like these?
http://www.klevercase.co.uk/
They're from a company that specializes in making dummy books
http://www.manorbindery.co.uk/
If you're from the Netherlands I found them at the
easereader.nl webshop which is (if you live here) cheaper than ordering directly from the company (with shipping et all)
Of course you can also make one yourself!
http://booksprung.com/how-to-make-a-...om-an-old-book
http://www.instructables.com/id/crea...r-using-sugru/
http://tablets.wonderhowto.com/how-t...-book-0125342/