Heh, I remember when Noctua was impossible to find online, nevermind in a brick & mortar.
I was going to suggest checking out J&R, but
1) They don't seem to carry Noctua
2) They apparently tore their buildings/block down to rebuild so they are online only right now
Shame, I used to love spending my lunch hour looking at CDs, DVDs and computer parts there when I worked downtown.
The biggest photo stores all carry computer parts, but they're all closed for Passover right now.
Data Vision might have something but I seriously doubt they have Noctua. You can get one of those Corsair self contained water cooling kits at a Best Buy, but again, no Noctua
Data Vision is opening another store on 23rd street between 5th and 6th, so I'll have Best Buy, Home Depot, Data Vision, and Tek Serve all within a block of each other. I love working in Flatiron
Edit: emoticon overload