Online platforms like Amazon or Barnes & Noble's website are good places to start. They usually carry a large number of books, and you might be able to find the Zaia Toussaint and Sebastian King novel there. You can also check your local library. Libraries often have a diverse collection, and if they don't have it in stock, they may be able to order it for you.
First, you can check the official websites of major publishers. Sometimes, they sell their books directly. Another option is to search in second - hand bookstores. You might be lucky and find a copy there at a lower price. Additionally, some e - book platforms like Kobo or Google Play Books may also have the novel available for download.