Has a big variety of international books:
Foreign Languages Bookstore, 390 Fuzhou Lu, near Fujian Lu.
Specialized on French books:
L'arbre du voyageur
上海市长宁区武夷路155号世星大楼4楼
地铁2号线江苏路站
http://shnu.bb-fr.com/t13-ou-acheter-des-livres-en-francais-a-shanghai