I have quite a lot of classic science books, e.g. on solid state physics, chemistry which I would like to sell. I am not in a hurry. Any ideas? ( I know of some services where you enter the ISBN of a book and they offer you some money for it, but the prices are ridiculously low when you compare it e.g. to the prices at abebooks). It is not that I am mainly interested in making money out of them, but simply that the possibilities to find someone interested in non-fiction books are much more restricted.