fair enough, then I'm going to suggest George Howell in DTX. It's probably within a 10 minute walk from South Station, and they have a really good selection. Try the Tarrazu French Roast to start, that's my go-to, and it's also their cheapest at like $15/bag.

George Howell started Coffee Connection, which was our Starbucks in Boston before Starbucks bought them out..