i am looking for a site where i can buy and sell used books ... dutch books :)

i am looking for rapsodie by elizabeth haydon
(the english version would be rhapsody)
its part 1 of a trilogy of which i already have part 2 and 3 in dutch (publisher: meulenhof)

i might also want to use such a site to sell a book, dragons of autumn twilight by weis end hickman (part 1 of the dragonlance series) .. i had part 1 already, but when i wanted to buy part 2 and 3 the whole trilogy was for sale for a lower price and 2+3 so i bought the trilogy, leaving me with part 1 twice :)

anyway .. does anyone know of such a site ?