Remembering this post, I checked out the House of Tea on 4th Street (just south of South Street, if you're walking it...)
I spoke with the owner a bit, and she was very pleasant, able to answer all types of questions. You can purchase tea there, but just an FYI, this is not a "tea house", meaning you cannot get served a cup of tea. It is strictly a retail shop.
Def stop by if you're in the area, but plan to go elsewhere if you want to sit down and enjoy a cuppa!