The question of which online shopping platform was cheaper to buy physical books was more complicated because different e-commerce platforms had different pricing and discount strategies. However, generally speaking, the following platforms might provide cheaper physical books to buy: 1 Taobao: Taobao is one of the largest online shopping platforms in China. Many sellers sell physical books on Taobao. You can search for specific titles on Taobao and find the corresponding sellers to ask about their prices and discounts. 2. Jingdong: It was also one of the largest e-commerce platforms in China and had a large number of bookstores selling physical books. You can search for specific titles on Jingdong and find the corresponding bookstores to inquire about their prices and discounts. 3. Amazon: Amazon is one of the world's largest online shopping platforms and has a large number of bookstores selling physical books. You can search for specific titles on Amazon and find the corresponding bookstore to ask about their prices and discounts. It should be noted that the discount and pricing strategies of different e-commerce platforms may be different, and the price of the same book on different e-commerce platforms may also vary. Therefore, when buying physical books, it was best to search and compare prices on different e-commerce platforms to find the best price.