Today I purchased a hardcover copy (missing its slip-cover) of The Fabric of the Cosmos: Space, Time, and the Texture of Reality by Brian Greene for one dollar.
Although purchased at the library, this wan't a used library book but a donation. By my estimation, the book probably sat on someone's shelf for a few years without being read ... at the most it was probably flipped through or skimmed a bit.
This book will now get to keep company several similar books that I have on my shelf but haven't yet read (but will eventually): The Road to Reality: A Complete Guide to the Laws of the Universe by Roger Penrose and Archimedes to Hawking: Laws of Science and the Great Minds Behind Them by Clifford Pickover.
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