My sister's family just started a new St. Louis-area business, The Easy Chicken, providing resources to those interested in raising chickens in an urban or suburban environment.
There are some potentially difficult and time-consuming aspects to keeping chickens in an urban environment: acquiring chickens, seeking permits or licenses from particular municipalities, finding a source for feed, coops, and other materials, and finding reliable information about keeping chickens healthy. The Easy Chicken's tagline is Backyard eggs made easy, and they have the easy part nailed down, as they'll help anyone through all the different steps, and provide all the necessary supplies (including guaranteed-to-lay hens!).
Check out The Easy Chicken's website for much more information, and please pass along the link to anyone you know who might be interested in raising chickens and having some fresh eggs and fun, finely-feathered pets!