which in fact means that they can charge you anything they like for the books.

lessen.ch does not sell any product for free. But if you ordered a product for CHF 0,00, lessen.ch asks you, if you still like to buy eg 1 Expl. KlickTel 2002, Ausgabe 1/2002 plus KlickRoute 2001, 3 CD-ROMs (ISBN 3980805131) for CHF 43,80.