Picked these up at the local library book sale, all a dollar each:
Alpha & Omega: The Search for the Beginning and the End of the Universe (hc) by Charles Seife
Carl Sagan: A Life (hc) by Keay Davidson
An Atheist in the FOXhole: A Liberal's Eight-Year Odyssey Inside the Heart of the Right-Wing Media (hc) by Joe Muto
Republic (pb) by Plato
The Road to Serfdom (pb) by F.A. Hayek
Mencken: A Life (hc) by Fred Hobson
Of these, I have previously read The Road to Serfdom and have listened to an audio book edition of Republic.