2. China Bookstore in Beijing has.
There is a second-hand book market.
4. the library.
5. If you can't find it, you can look at Mr. Feng's A Brief History of Chinese Philosophy, World Book Publishing House. There are 38 and 24 yuan. Depends on which one you want to buy. There are also original English versions.
6. The address of the electric donkey is /topics/ 145637/
It is the picture below. People's publishing house.