You seems to be New York Giants fan and so am I.
Well there are many online sites from where you can buy the events tickets. But when it comes to get tickets at best rates, I always go for "ticketsmate".
The good thing is they do offer discounts :)
I already grabbed one for New York Giants vs. Washington Redskins, Thu Sep 24 2015.
And if you'll find some better price do let me know too :)
I know people that have used StubHub. You can check them out online to see how much the tickets are...... (: