Every relatively well sorted library will carry Sacher Masoch's "Venus in Furs" and at the very least de Sade's "Justine" (if you're lucky the rest of his work too). Those two count as classics -- you may even read them on the street without blushing I think the Story of O (by Pauline Reage -- I agree with Tojo, it didn't do anything for me either) should be available too. You may also want to check out some of Anais Nin's stuff -- some of it has some rather subtle BDSM elements in it.