Montgomery County, Frederick and greater Baltimore
Just over the D.C. line, Montgomery County has shops in Silver Spring, Rockville and Gaithersburg, and a couple of the Silver Spring listings are a short walk from Red Line stations. Frederick, at the top of I-270, has game stores on Buckeystown Pike as well as a sports-card shop.
Baltimore's own listings are mostly game stores. Many of the area's shops with sports cards are in the suburbs instead, in Ellicott City, Reisterstown, Glen Burnie and Forest Hill, and south toward Annapolis in Edgewater. Yu-Gi-Oh! is common in Maryland's game stores, usually stocked next to Magic.
Card shows, conventions, and tournaments happening across Maryland.