There are several places you can search for the 'Marie Curie Graphic Novel'. Specialty bookstores that focus on science - related or biographical books might stock it. Another option is to check with independent publishers' websites. They often sell their own publications directly. Additionally, book fairs or events related to graphic novels or science history could be a great place to find it.
Online platforms such as Amazon are a good place to start. They have a wide range of books, including graphic novels. Just search for 'Marie Curie Graphic Novel' and you might find it there. Also, some library websites may have it available for borrowing, so check your local library's online catalog.
You could try looking in local comic book stores. They sometimes carry graphic novels on various topics, including historical figures like Marie Curie.