I almost always turn to

I almost always turn to Bibliofind for out-of-print books, and I often get lucky. My latest effort involved trying to find the three Discworld "Watch" novels (Guards! Guards!, Men at Arms, and Feet of Clay). Amazon sported a 4-6 week for Guards! Guards!, so I tried Bibliofind. Turns out, Seaside Book & Stamp has a bunch of the Discworld books. Mine arrived promptly, and in great shape. Discworld fans can search Seaside here.