As of the latest chapters I've read, Todo is still alive in the JJK manga. The story hasn't depicted his death yet.
Todo's appearances in the JJK manga are scattered. It depends on the specific storylines and conflicts. Sometimes he's in the foreground, and other times he makes cameos to add to the overall narrative.
Well, a lot of people get the ToDo JJK manga from major online retailers like Amazon or specialized manga websites. Libraries sometimes have it too.
No, Miwa didn't die in the JJK manga as of the latest chapters I know.
Megumi is not dead in the JJK manga. The manga continues to feature him and his adventures. The story hasn't reached a point where his character is killed off.
Miwa remains alive in the JJK manga. There are no events or plot developments that lead to her death. It's possible you might have misunderstood or there's a mix-up in your sources.
Sorry, I don't know exactly how Haibara died in the JJK manga. It's best to keep reading and discover it for yourself as the story unfolds.
No, Gojo doesn't die in the JJK manga. His fate is still unfolding in the ongoing story.
Yes, Nobara tragically dies in the JJK manga.