Where can I buy the most formal Book of Changes?

Xinhua Bookstore and other regular bookstores. Xinhua Bookstore is a state-owned book publishing enterprise in People's Republic of China (PRC), which belongs to the Central Propaganda Department of People's Republic of China (PRC). It is the official bookstore of the country, which sells genuine books. The Book of Changes is an ancient classic that expounds the changes of everything in the world, including Lianshan, Ghost Stories and Zhouyi.