In case you didn't take me seriously when I suggested you start to brew your own beer, you should reconsider this growing trend because Brooklyn Homebrew has officially opened in Gowanus. Danielle Cefaro and Benjamin Stutz now have a real store as opposed to their dining room in a Sunset Park apartment, and more space means more yeast, hops, and malts.
If you're still wary, remember--it's 2010, which means that you can learn to do anything on youtube, including how to brew beer in your 600-square-foot apartment. Your girlfriend may object, but she'll eventually get used to steamy windows and what smells like a Kellogg's factory for a few hours every month. So what's stopping you? Head on over to Brooklyn Homebrew and get your hops on.