The price of Harry Potter series in the bookstore

I remember I bought Harry Potter when I was in grade five or six in primary school. Now I'm a sophomore. At that time, the first one was around 20 yuan, the second one was around 30 yuan, the third one was around 40 yuan, the fourth one was around 50 yuan, and the fifth one was around 60 yuan. I wonder if the price of the seventh part has gone up now.