There are several big bookstores specializing in teaching materials in Chongqing.
For example, the major bookstores in Shapingba are the agents of Chongqing Higher Education Society (there are only four in Chongqing).
Beirun is an agent of FLTRP, and there are only three or four in Chongqing.
All books can be bought in these bookstores. Although some books are not available at the counter, they can be bought.
I don't know which publishing house published your book, please tell me in detail. Many books have the same name.