1, Taobao: Taobao is a platform for purchasing physical books. You can buy physical books from Chinese businessmen or buy discounted Dangdang e-books.
2. Confucius old book network: Confucius old book network is the most comprehensive book category, and you can buy many out-of-print books and ancient books.
3. Salted fish: Salted fish is a place where you can buy and sell second-hand books. You can find many high-quality second-hand books about salted fish. Although the quality of second-hand books about salted fish may not be high, some brand-new books can be obtained by communicating with sellers.