Call me silly... BUT THIS HAS ALWAYS WORKED FOR ME.
Especially in major cities... When I decided late to go to a game (College, Hockey, Baseball, Or even the NFL I did it in Tampa..)
Just show up. Wait until the game has started. After it is about 4 or 5 minutes into the game the scalpers will sell you tickets at way below cost.
They dump what they have.
I have never been shut out.
""People Will Probably Never Remember What You Said, And May Never Remember What You Did. However, People Will Always Remember How You Made Them Feel."