A great book about the economics of uncertainty:
The Black Swan - $12.56
The Impact of the Highly Improbable
by Nassim Nicholas Taleb
You can hear the author
discuss this book on EconTalk.
Or these
very funny political satire books:
The Ceo of The Sofa - $9.90
or
Peace Kills - $8.96
by P.J. O'Rourke
I haven't read this but it looks interesting:
Physics of the Impossible - $12.56
A Scientific Exploration into the World of Phasers, Force Fields, Teleportation, and Time Travel
by Michio Kaku
And if you are interested in fiction, I cannot recommend highly enough Alexander McCall Smith's books about the "No. One Ladies' Dective Agency" in Botswana. They are a very enjoyable read with simple but lovable characters tackling trivial issues of life in Africa. The first book is:
The No. 1 Ladies' Detective Agency - $6.64
by Alexander McCall Smith
But if you read that you wont be able to resist reading the rest of the series: