The butchers at MEat in Kittery told me about this place a few months ago. I didn't have time to check them out last time but made time on my last outing.
They are next door to the Black Trumpet and I think they are affiliated.
Anyway, this is a small shop, just this side of precious. But the spice quality is top notch. It's also pricey. A one oz bottle is about $5-$6 (I bought two bottles). But wow, are these spices fresh. The chinese 5 spice was a rich color with visible bits of sichuan pepper. I also bought the berbere which made me want to sprinkle it on anything.
If you are in the area, it's worth a stop by. I think it's only 2 miles from MEat. But, I'm not sure it's worth a special trip.