not a bad idea. Dan, care to do the honors?
Being the area expert, would you mind pulling together a list of LFS to visit while out there.
Here's a list of places to go and visit:
Country Critters in Patchogue - decent livestock, not so much stuff plant wise, has a variety of bettas (I got my silver dragonscale plakat there), has an indoor pond with large predatory fish.
Magic Isle Aquarium in Centereach - prices are a bit high but they often have hard to find livestock sometimes. I used to go here all the time when I lived out in LI.
Aqua Hut in Coram - probably the best LFS I've been to on LI. Great prices on hardware, food, and substrate (near Amazon prices), high quality livestock, not so many plants.
Jungle Bob's Reptile World in Centereach - Not really fish related but they have a decent stock of reptile and amphibian supplies and livestock. Also a wide variety of larger live foods.