Boswells, CI and Wingenroths are all just about one hour from Harrisburg.
Boswells: the shop blends are pretty unique and priced right. He has a pretty good tin selection, but those prices run high. The family treats you like one of theirs and they have a comfortable lounge, actually two.
CI: Very limited pipe resources, but tin prices are excellent. The lounge/bar is amazing. The monthly Pipe Guild meeting is worth attending.
Wingenroths: Once you get to know Mel, he is a great guy. His tin selection is the best on the East Coast (buy 4, get one free). He usually has a nice selection of estate pipes. A very small shop, with limited room, but dusty & crusty, just the way I like it (same for motorcycle shops).