I hit up Suzie every time we go to New Hope. They literally have just about every hot sauce imaginable. If it's hot, they have it. If it's there, you can sample it. I went this this past weekend and bought 5 new bottles to try.
After visiting Suzie, head on up to Peddler's Village. It's a short drive from New Hope and there's a gourmet food store with an entire room of various hot sauces. They had some stuff that's long since discontinued for the collectors out there. I bought another bottle there on the same day.
Suzie Hot Sauce is basically the Mecca for chileheads on the east coast though.