There are a few options. Some public libraries offer digital collections that include graphic novels that you can access for free. Also, websites like Project Gutenberg sometimes have older graphic novels in the public domain.
Well, there are a few sites like Project Gutenberg that sometimes have graphic novels available for free. Another option could be looking for free promotions on popular ebook platforms. Just make sure the source is legal and reliable.
You could try some public domain websites or platforms that offer free content. But be careful as not all of them might have legal rights to distribute those graphic novels.