Hey! I don't cross the DC line often, but I've been to Ben's when my daughter lived near there a while back. They're good, but I think a much better half-smoke is at a place called Meat & Foods on Florida Ave. He makes them himself in-house and I think they are the best in the city. It's a tiny little place. You can get them ready to eat but you can also buy them raw to take home but you have to order ahead. Best in the city!
Half smokes used to be really hard to find in the grocery, but the past few years these have been in Harris Teeter and they are excellent IMO. Just put them on your kettle smoker and when they're done, add some chili, some onions, some cheddar, and a bun! Very tasty!