Just wanted to let everyone know, there is a new indoor/outdoor gardening centre located in the Carroll Gardens neighbourhood in Brooklyn (521 Hick St, corner of Hicks and Degraw) Called Brooklyn Farms. They have a good selection of hydroponic equipment and organic gardening supplies. I went in yesterday to purchase nutrients for my garden,the staff was very nice extremely helpful and the pricing was very good.
I recommend Brooklyn Farms to anyone that is looking for gardening supplies, they seem like good people over there.