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Amazon Prime credit cards is a good choice for customers with an eligible Prime membership - it offers 5% cash back on Amazon purchases. Don't forget that Prime membership costs $99. If you are not an eligible Prime member you may choose from other credit card with cash back rewards. For example, the Discover it® Cash Back credit card offers to Earn 5% cash back on everyday purchases at different places you shop each quarter like grocery stores, restaurants, gas stations, and more, up to the quarterly maximum when you activate. When you reach the cap, you will continue earning 1% cash back on all purchases. Also Discover will match ALL the cash back earned for the first year (provided you are a new cardmember). You can redeem rewards any amount, anytime, it is also possible to use rewards to pay at checkout at If we consider the interest rates of these two cards, the Discover it® Cash Back credit card comes with 0% Intro APR (15 months) on purchases, the ongoing APR is 17.24% - 28.24% Variable APR.