Just moved to Montgomery Co myself and was asking the same question. So Iwas able to geta card from the sales person in the hunting dept at Dick Sports for a processor in Silver Spring. He said he has used him for the past 3 yrs and likes his work. I called him and he is still operational and accepting deer this season. Here is his info....

Deer Butchering
Bob Parker
11318 Newport Mill Rd
Silver Spring, MD 20902
301.946.1622