This is not a lament—it's a honest question. Where are they? Which ones do you know that I don't?

A friend wrote to ask me what shops in Manhattan have a good large selection of new SF. I had to cop out and tell her the Barnes & Noble at Union Square. For independents, I said I know that St. Mark's Bookshop usually has a decent and interesting if not huge selection of SF. I had to resist the temptation to go on at length about all the great shops that have met their demise here in the past decade, or that have pretty much abandoned the goal of keeping a good supply of SF in stock. (Forbidden Planet, I'm talking to you!)

So, where do you go for SF in book form in Manhattan?