Good morning, disney or bust! Welcome to Maryland. We have lost a couple of Disney Stores in MD in the past few years, unfortunately. It sounds like you might be in Southern MD (like me!)...that's Charles, St.Mary's, and Calvert Counties. If that's the case, the store in Waldorf is your closest store. We are used to a good bit of travel down here to get to the modern world of shopping, lol. I am about a half hour from the Waldorf store, and they do still sell Disney Dollars as of very recently.
Snow White gave you the other MD locations, as well as Gaithersburg and Hagerstown, but those are very far from me. If you are towards or in Southern MD near me, your other choices in shopping would be Northern VA, and Cee gave you great directions to hers. Last time I was there, there was also one in Fredericksburg, VA., which is about an hour from me if traffic is good, lol.
Feel free to PM if I can be of any more help.
Hey, we just returned from WDW on Saturday, and are usually there each September for the pin event! Maybe we'll be there at the same time!