Average Pittsburgh Steelers ticket price?

I am trying to take my boyfriend to a New England Patriots game this year. We live in Virginia & ESPN posted the New England opponents. The closest one will be the Steelers. I was wondering how much the tickets usually are? How do I make sure I get the right ones - we are Patriots fans going to the Heinz Field. Do I go to the Pittsburgh website to get the prices?? or what do I do?? I need to know how much to save up, so I can do this..hopefully this year. As much information as you can, will help a ton. Thank you!