According a post by user davidknowsbest on Reddit,  the Sallie Mae Rewards credit card will be discontinued soon. On March 1, 2017, the card will convert to Commence Mastercard. The Sallie Mae Rewards card had not been available to new applicants for about a year. Prior to that, it was originally marketed with students in mind, but quickly became a favorite for anyone looking for high cash back rewards. The card offered 5% cash back on Amazon.com, books, gas, and grocery purchases, and 1% cash back on all other purchases. Legacy cardholders continued to enjoy the benefits of the card at no annual fee. On March 1, 2017, that will change. According to…