1, China Book Network: a website dedicated to books of various publishing houses. Some are not very popular, and some are taken off the shelves in bookstores or relatively unpopular. There are also many good books, and the discount is really hard. They are all sold by the box, which is guaranteed.

2. Confucius Old Book Network: The book-missing network has a special option, which can find out the lowest price of the whole network every time you search for a book.