There are stores in Times Square - those ones that sell all the cameras and laptops that you can get for $2000 less at BestBuy that actually do sell some random radio stuff.
I've found SP10/20 radios brand new in box (motorola), Yaesu, Kenwood, and other amateur equipment that is collecting dust and turning yellow.
It is actually extreamly amusing to see it, and then ask the guys how much it is. I saw a VX1R priced at $600 at one place. Just amazing.
You can find anything in new york city, it just depends on where you look, what piles of dust you check under, and who you know.
Good Hunting.
Oh, and if your looking for any new in box ISA cards - that's a good place to start too.
-Alex