Here are the websites of two large Chinese bookstores, one in Beijing and one in Shanghai. You will need a Chinese language-equipped browser to read these websites.

Beijing Tushu Daxia (www.bjbb.com.cn)
Beijing Book Mall, the biggest bookstore in Beijing, accepts Mastercard and Visa.
Email address: jyw@bjbb.com.cn

Shanghai Shucheng (www.bookmall.com.cn)
Shanghai Book City has 200,000 books and audiovisual products. They accept Visa for international customers.

More information on book-buying in Beijing can be found at Beijing Bookworm - Chinese Language Bookstores on the U.S. Embassy Beijing web site at
www.usembassy-china.org.cn/english/sandt/bjbkwrm.html