If you purchased select Kindle e-Books from April 1, 2010 – May 21, 2012, you may have account credits in your Amazon account due to a Class Action Settlement regarding a possible conspiracy among five top U.S. publishers (Hachette, HarperCollins, Macmillan, Penguin and Simon & Schuster) and Apple to fix and raise the retail prices of e-Books.
To see if you qualify, simply log in to your Amazon account and check to see if you have received settlement credits. For full details, click here. If you qualified, your account credits will already be in your account.
UPDATE – You can also check your Barnes and Noble account under gift cards if you’re a Nook user!