In fact, parents don't want you to buy anything back, because shopping also costs them (for you), and then they will give you more living expenses and increase their unnecessary expenses. They want you to bring back a good report card, and they can show it off in front of colleagues and neighbors, which is what they are most happy about.

If you have to buy it, buy local products. Remember, don't spend a lot of money, or they will be more unhappy.