I'm a Seahawks fan and my little brother is a Falcons fan

So my little brother is coming up from Atlanta and we want to see the Seahawks vs. Falcons in October. I've never actually been to a Seahawks game so I was wondering where all people can get tickets from? I just did a cursory google search and found tickets for $159 each and are as far away from the game as you can possibly get and still consider yourself to be on Earth. Is that a pretty typical situation?