Help me! I'm trying to make my dreams come true!

My roommates and I are going to Washington the bigging of October and it just so happens that my FAVORITE band is going to be there at the same time .... THE BLACK KEYS. There is only one problem. They are sold out and the only other tickets I can find are over $150. I am a poor college student and can't afford that! So I am asking if anyone knows anywhere I can find cheaper tickets or just any solution to my problem! Please help me!