Children's picture books can be purchased through the following channels: 1. Offline Bookstore: You can take your children to the bookstore and let them choose their favorite books, so that you can better understand their reading interests and needs. At the same time, bookstores generally have discounts and preferential activities, which can enjoy better price concessions. 2. Online Bookstore: You can buy children's picture books in online bookstores such as JD.COM, Dangdang and Taobao. These websites have a large number of children's picture books to choose from, and the prices are relatively cheap, and there are often preferential activities. 3. Library: You can apply for a library card to let children borrow their favorite books, which can save the cost of buying books. 4. Picture Library: Children can participate in the activities of the picture library, not only borrow picture books, but also participate in activities such as picture book lectures and painting competitions, which can not only save the cost of buying books, but also increase children's learning fun. Generally speaking, the key to buying children's picture books is to choose books suitable for children and buy them from formal channels to ensure the quality and reasonable price of books. At the same time, children's reading experience and learning pleasure can also be increased by participating in activities such as libraries and picture books.