It’s important to start saving for your children's education as early as possible, especially if you are a single mom. One of the best ways to do it is by opening a 529 college savings credit card. One of the best 529 credit cards on the market is the Fidelity Rewards Visa Signature Card. This card offers 2% cash back on purchases, allowing you an option to transfer points earned directly into a 529 college savings account opened with Fidelity.