If you purchase at least €12.50 worth of books in the Dutch language during the annual Book Week (10-18 March 2018) you get Griet Op de Beeck’s novel ‘Gezien de fieten’ for free. All bookstores in the Netherlands participate, online and offline.
If a conductor comes along for a ticket check you can simply show the hard copy or the e-book. Be aware that this day trains may be overcrowded. In 2016 and 2017 around 250,000 people traveled with their Boekenweekgeschenk.