You can order what ever you need from B & H photo and video
http://www.bhphotovideo.com/
I have ordered from them for a company I work with. They have high quality wireless lav mics that would have the range you need for a football game. If you dont have speakers and power amps then make sure you get powered speakers so you dont have to buy the amps. You would also need some sort of mixer so you could have a second mic in the both.
Hope that helps they have great customer service so you can email them or call to get their help as well