Barrington would be worth a look. They sort of specialize in Indonesian coffees, but for what they are, they're generally exquisite. They do some Single Origins from East Africa and S. America too, but I have a feeling you'd like their offerings.

Side note, Cafe Fixe (in Brookline and JP) serves this coffee, but there are actual Barrington locations in Boston. Fixe also has other bulk beans for sale that are generally regionally local and are always great too.