We have a really nice independent league ballpark here in town. I can get a 16 oz Leinenkugel's Red for $4.75, and I get a dog with that. After that I eat a bag of peanuts with another beer or three for the rest of the game.
I do most of my drinking while tail-gating before the game, but typically I'm good for one beer (depending on how bad we are losing that might turn into 2 or 3). I compliment it with a big bag of salty peanuts.