Baltimore has a long brewing tradition and Camden Yards makes a small nod to that by offering "Old Line Microbrew" kiosks offering better beer throughout the ballpark. There are two kiosks of this type on the main concourse and I spotted one way up in the concourse for the cheap seats; they are all basically the same. They offer local brews in the form of Heavy Seas Classic Lager, Falmouth Copper Ale, Flying Dog Old Scratch IPA and the imported Heineken. At some of these kiosks the selection is expanded to include Guinness, Smithwick's and Harp lager.
The prices are steep, $7.50 for a 16oz pour but considering the park is charging $7.25 for 16oz of Bud Light, it's a relative value. There is also a Blue Moon kiosk on the main concourse behind the home plate area, same price and a better option than Miller Lite.
In the luxury box section there are taps for Stella Artois and Samuel Adams Boston Lager at the various bars.
There are a lot of great beers brewed in Baltimore and Maryland in general and it would be great to see more of them represented at the park but there are some quality brews to choose from.
Now, if you are looking for a great beer experience before (or after) the game, just a block from the stadium is the Pratt Street Alehouse, specializing in English-style ales including three varieties on cask. The prices are good, the beer is great and its proximity to the ballpark make it a must stop if you are a lover of fine ale.