Penguin Group (USA) LLC via Amazon has The Algebra of Happiness: Notes on the Pursuit of Success, Love, and Meaning (Kindle Edition) on sale for $1.99. Thanks chunwillyNote: Eligible Prime members may apply earned No-Rush Shipping credits to this purchase (check balance).PENGUIN GROUP USA, INC. via Apple Books also has The Algebra of Happiness: Notes on the Pursuit of Success, Love, and Meaning (eBook) on sale for $1.99.The following is no longer availablePenguin Group via Barnes and Noble also has The Algebra of Happiness: Notes on the Pursuit of Success, Love, and Meaning (NOOK Book) on sale for $1.99.