<prompt> Human: I want to improve my credit. Currently have one credit card through my credit union. I spend a lot of money on amazon gas. I heard the Sallie Mae credit card was good with rewards through Amazon Gas purchases. I read it was 5 back with amazon, but when I went on the Sallie Mae site I believe I saw it was 3. Can you recommend me a good card to build my credit that also offers rewards cash back on Amazon? My credit score is good, but I have a bad history with chase bank, so I cannot apply for the Amazon chase card. Thanks!  <response>: Sallie Mae mastercard got nerfed, people who already had it still have the 5 to gasgroceriesamazon but new people cant get it.Discover It would be your best option. This quarter for me is 10 back from Amazon. This is due to the 5 back and a promo which doubles all cash back in the first year. When you apply see if you can get that promo, its good. Also if you have apple pay youd get 20 back until the end of the year when you use apple pay with that promo.I know you said you cant use Chase but Chase Freedom also has a quarter that is 5 to amazon and a quarter that is 5 to gas. 