Give more than a dozen examples of regular online bookstores.

1.99; Dangdang; Amazon; JD.COM； Wonderful network; I have bought books in more than one online bookstore.

2.Suning.cn； Wide book city; Wenxuan.com； Boku.com；

3. Second-hand or ancient book bookstore: Confucius (also bought).

I hope I can help you ~~O(∩_∩)O~