Franklin's in hyattsville is a microbrewery with a general store on the first floor; between the toy and beer section there is a fantastic selection of hot sauces. Turns out the owner is a hot pepper enthusiast and loves his sauces! So far I've picked up 4 different sauces from there and have been thinking about making another special trip to fill growlers too. There are probably about 30 different kinds and are reasonably priced.
