Sign up for a Discover More Card and get a $100 cash back bonus when you spend $500 or more in the first three months. That's one of the best Discover credit card promotions we've ever seen. Other card features include earning 5% Cashback Bonus on select category purchases. Plus, earn up to 1% unlimited Cashback Bonus on other purchases after your total annual purchases exceed $3,000. This card features no annual fee, a 0% intro APR on balance transfers for a full 12 months, and a 0% intro APR on purchases for a full six months.