The beers at this party were almost exclusively brewery-only, with all the stouts I sampled being incredibly difficult to get, even at the breweries themselves (think one release per year, with very limited bottle/can runs). This is one reason why it was such a draw for the collective DC-area (and beyond) beer geekdom. Also, pretty much every stout I tried aside from the Aslin beers were from outside the area - the closest to you I think is Voodoo, which has a location in Lancaster.
I wish I could give some suggestions, but these beers are just so hard to find, with some going for $100+ on the secondary market (if you can find them).