Amazon has Puzzlebook: 102 Puzzle Quizes FREE to download! This is Volume 3 in the Top Rated Puzzlebook Series. It will be FREE until August 2nd, when the price will return to $2.99.
Remember, although this book is intended for the Amazon Kindle, you can always download a free program that will allow you to read Kindle books right on your PC, iPad, iPhone, Mac or Blackberry!
Also, please keep in mind that prices on Amazon change very quickly, so make sure to double check to make sure that your book is currently free (and not just for Prime members) before you download it.