It's not 'in the neighborhood', but Charlie Browns Store is just across the WV border, in Charles Town, WV. They have a good selection, including some vaporizers (I bought my Volcano there). I'm not sure if they still carry the Volcano, though, or they just can't keep it in stock - last few times I was there, they didn't have any.

If you head out Route 7 West, out in Leesburg/Loudoun County to Route 9, and then take Route 9 (Charles Town Pike, I think, but know it's 'Route 9'), you'll come across Charlie Browns Store. It's a small white building, on the right side of the road, shortly after a mid-size bridge. If you hit the 9/340 bypass, you went too far.