If you want to earn as much cash back as possible on your Amazon purchases, you have two options. First, is to become a Prime member (the Prime membership costs $99) and apply for a Amazon Prime Rewards Visa Signature Card. This cards offers Prime members 5% cash back on Amazon purchases. The second option, is to get a credit cards that offers more than 5% cash back. The Discover it® Cash Back offers 5% cash back at different places each quarter like gas stations, grocery stores, restaurants, Amazon.com, or wholesale clubs up to the quarterly maximum each time you activate. The card doubles all the cash back you earn in the first year if you are a new cardmember. The bonus category for the fourth quarter of 2018 is Amazon (from October through December 2018). The card comes with no annual fee and offers 0% (14 months) APR on Purchases, 13.99% – 24.99% Variable after that.