The Beak of the Finch: A Story of Evolution in our Time (hc) by Jonathan Weiner for $1.00.
Storm World: Hurricanes, Politics, and the Battle over Global Warming (hc) by Chris Mooney for $1.00.
Baudolino (hc) by Umberto Eco for $1.00.
Heat: How to Stop the Planet from Burning (hc) by George Monbiot for $1.00.
These are all former library books; the only one that appears to have ever been checked out and/or read is The Beak of the Finch, the other three look more or less brand new (with Storm World looking like it has never even been opened before.)