The foreign language audio-visual bookstore should be able to find the books you want, and it is more convenient to take the bus.
However, if it is safer, it is recommended to come to the new campus. There is a foreign language audio-visual bookstore in Xiao Juan Village, and there is also a bookstore on the first floor of the campus library, which sells a full set of reference books for postgraduate entrance examination, but it seems to be more expensive than the bookstore in the village.
You can also watch small advertisements at school. Our school often has research friends selling reference books for postgraduate entrance examination, which is very affordable.