I've stumbled upon a perfect place & I wanted to share it with you. Have you been to the Friends of the SF Library's used bookstore at Ft. Mason? It's called Book Bay Ft. Mason and it's wonderful. Clean, newish-looking books in great condition for totally fair prices. I've found Italo Calvino's Invisible Cities there (three copies, I keep giving them away) as well as a paperback of three Toni Morrison novels. I just started re-reading Sula for a class I'm teaching in the Fall.