They are still in Bealeton, Virginia which is not far from Washington, D.C. - it's out past Manassas. You can drive there or fly your own plane into Warrenton/Fauquier airfield and get a shuttle ride in.
They mostly have Stearmans including one of the 450HP monsters, but they also have a Waco, a Fleet, a Ryan, a Cub and some kind of a reproduction Fokker Eindecker. It is a small operation but its a fun way to spend a Sunday afternoon, especially if you buy an acrobatic flight in a Stearman or the Fleet before or after the show. What a hoot.
http://www.flyingcircusairshow.com/