Here in St. Petersburg, FL, Tropicana Field (Tampa Bay Rays) sells 16oz beers for $5.75.
That field is 2 miles from my house, and I typically attend 4-5 games a year. To their credit, the field offers free parking and will let you bring your own food and non-alcoholic drinks into the stadium, so I have no problem packing a sub, some peanuts, and a few bottled waters then paying the $5.75 for 2-3 beers. Tickets to the game are typically about $12-15.
About 15 miles from me, however, is Brighthouse Field, home of the Philadelphia Phillies Single A affiliate, the Clearwater Threshers. Nice, nice minor league park. I go to about 7-8 games there a year. General Admission tickets are $6.00.
Every Monday home game they do $1.00 12oz beers, along with $1.00 for pretty much all food (pop corn, peanuts, hot dogs, hamburgers, ice cream sandwiches). The $1.00 beer even goes for the Gordan Birch beer stand, as well as all other import beer stands. A few times a year, they even do an all you can eat and drink, including all domestic and import beer, with a flat rate admission of $17.00.
The day I go the most, however, is "Thirsty Thursdays." The stadium has a nice full service bar right up against the right field wall. I sit at the bar, watch the game, and enjoy 2 for 1 Yeungling drafts, which equates to TWO 24 ounce beers for $3.75. THAT'S fun at the ballpark!!