I walked into Troika Gastronom today, and noticed about a dozen different Russian beers for sale, most of them in single, 16-20 ounce bottles or thereabouts. I can't vouch for how long they've been sitting on the shelves, but I can vouch for the selection.
If you're in Seven Corners, or around Pizzeria Orso in Falls Church, the little-known Hillwood Avenue (one of the "seven corners"), VA Route 338, is your secret pathway.
Look at the tweet (is "tweet" capitalized?), and you'll see that cake, carrot mentioned that Halalco, a large Halal grocery store next door, is the best source for goat in the NoVa suburbs - I haven't been, but I trust Jake's palate. The two of these stores, in such close proximity, make this worth a detour, and New Grand Mart - putting three interesting ethnic grocery markets in a one-mile diameter - makes it worth a journey.