Where can I watch the musical wicked online? Or read?

Just like the question says. Where can I watch the the Broadway musical online? I can't afford to go fly and see it. Or I am willing to read it somewhere online too. As long as when I read it it will tell me which songs to listen to at each part. I really want to watch this musical. I've heard almost all the songs and they are amazing. They tell an amazing story, but they are kind of confusing without being able to see whats going on. I would like to do this free preferably.