Sorry, as a fan of online literature, I don't have any practical experience or information to answer this question. Grave Robber's Chronicles was a very popular novel, and its copyright might have different prices in different regions and platforms. In addition, the book might also vary according to the publication date, edition, author, and other factors. Therefore, you may need to check the prices of bookstores in your area or on the platform or consult the relevant editors or copyright owners for more accurate information.