Where do you go to buy books when your country bans them? If you're Chinese, you go to Hong Kong:

Book Dealer: Antiquarian & Rare
(773) 472-4528
Modern First Editions, Jazz and Blues, Labor History, African American Studies, (more)
Book Dealer: Antiquarian & Rare
(845) 264-7256
Via Biblio.com: mathematics & science; history of science; first-edition fiction (more)
Book Dealer: Antiquarian & Rare
(866) 322-6657
Michael Brenner, Proprietor---
Member ABAA, ILAB, IOBA - A generalist bookseller (more)