1. Low cost: Boku. The flagship store of com belongs to an online shop. Compared with physical stores, it can reduce the cost of store rent and sales salary, thus reducing the price of books.

2. Large sales volume: Boku flagship store. Com has expanded the sales for all netizens, which can also reduce the cost and reflect the book price.

To sum up, the reason why Boku books are cheap is because online sales mode is adopted, with low cost and large sales volume.