Other than Hammersmith, there is Hennessey Homebrew in East Greenbush. Its on Rt 4 just north of Rt 43. I've been to both for a few odds and ends in the past and have no complaints. Both were helpful and seemed to have a good variety of things in stock and ready to buy. Hennessey would be worth the extra 20min or so drive it would take you from Halfmoon to check them out one day.