There is generally a 20% discount. Of course, it depends on what books you buy. There are many books there, and they are selective.
Or go to Tianjin Book Building, where all the books are genuine, but there seems to be no discount, only activities.
You can have a look. I suggest going to Nankai District Book Wholesale Market. 863, 90 1 and 47 all pass by, which is very convenient.