2. China Book Network. A website that focuses on books from various publishing houses, some of which are not popular, some of which are taken off the shelves of bookstores or relatively unpopular, and many good books are sold by the box, which is guaranteed.

3. Confucius Old Books Network. The characteristic selling point of this website is that there are ancient books, rare books, books with dates, and even some unpopular books that have not been sold, which can be found here. But the price is high or low, and the postage is more expensive than China Book Network.

4. lack of books. There are special filtering options, and you can find the lowest price of the whole network every time you search for books.