How can i look up bus ticket prices?

I tried google, and the basic links there. Wouldn't give me a sechdule or prices (which kids seems like a basic thing to put on a busting website). But I met this girl, and I've just been dying to see her. The problem is, she lives 2 hours by car away. And I don't have a car yet. So I'm going to try and get a bus ticket from grand rapids michigan to Ann arbor michigan. Also, I'm only 15