You could start from the chapter where the anime ended. Usually, there are forums or fan communities that discuss this and can give you specific chapter recommendations.
There are several options. Some people find it on dedicated manga websites like MangaFox or MangaReader. But be cautious as some of these sites might not have proper licensing. You could also check if your local library has digital or physical copies for borrowing.
Online platforms like Amazon are great places to start. They have a wide range of books, including light novels. Also, check out some specialized book - selling websites that focus on Japanese or international light novels. There's a good chance you'll find 'stormbringer bsd light novel' there.
You might have luck on platforms like KissManga or MangaPark. However, always check for the legitimacy of the site and be aware of any potential risks to your device or personal information.
Some libraries also have digital collections of manga. Check your local library's online resources to see if they offer Stormbringer BSD. Additionally, some subscription-based manga platforms like Crunchyroll Manga might have it.