BM dresses

When I got my bridesmaid dress for my sisters wedding I went to this in Ridgewood called Flowerama. They had a HUGE selection of dresses....I was totally planning on looking there with my sister but I called and they're not doing dresses anymore!
So I'm looking for a place that will have a large selection of bridesmaid dresses to check out. I live in Boston and will only be in LI for one day in September so I just want to make the most of my time...any suggestions of a place we could go with lots of dresses??