Coca-Cola offers a $5 Amazon Gift Card for free when you pour five beverages at a Coca-Cola Freestyle machine between August 1 and 31 and log them in the Coca-Cola Freestyle app for iPhone or Android. (You'll need to use the app to scan the QR Code for each pour you make at a Coca-Cola Freestyle machine.) The app also lets you find nearby Coca-Cola Freestyle machines and create and share drink mixes.