There seems to be no discount. There seems to be something like "original English books can't be discounted with a second-class discount card" behind the discount card. But you'd better ask the staff. I think if you want to buy good quality and guarantee, you'd better go to a big bookstore. After all, if you buy it online, you can only look at the quality of the goods you receive, which will delay things.

By the way, if you ask Hito's card for a discount on this kind of books, I happen to have a 600 yuan settlement card issued by the company, which seems to be 15% off. If you believe me, I will pass it on to you. I have nothing to buy.