well i searched on the net as hard as I could and found no hatcheries in Maryland, or in any of its bordering states!
did you check with all your local feed stores? if you don't mind ordering a dozen or something, you can also order from hatcheries further away from you via the mail. here is a list of hatcheries:
http://www.feathersite.com/Poultry/BRKHatcheries.html
Also, at this pet duck group:
http://groups.yahoo.com/group/petducksrus/
Then some of the members have rouens, and occasionally they want to get rid of some of their ducks' eggs. If I;m not mistaken they're looking for someoen to take a few now, but they may have already hatched.