If you are an Amazon Kindle owner, I have good news! Amazon is offering $5 in free "Coins" to buy any apps for your kindle that you want. You don't have to do anything special, just go to www.amazon.com and there is an announcement on the homepage!
Coins are going to be a new currency for apps on amazon and you can buy them at discount (each 100 coins is equal to $1). So if you purchase them, you are essentially getting a discount for buying something you wanted anyway.
But again- if you own a Kindle Fire, you get 500 free coins to spend on apps!