Shopping
 
ThinkGeek
I always wanted a binary blanket. And a laser. And a geiger counter watch. And...
American Science Surplus
If I were a mad scientist, I'd shop here. As it is, I'm just irate.
Gameskins
Up, up, down, down, left, right, left, right, B, A, B, A, Start
Wear what you remember.
Genki Hats
Cosplay for your head.

If you ski, you need a few of these.
ZipZoomFly
Okay, they used to be called GoogleGear, but guess who made a fuss?

I built my computer from their parts.
Amazon
Even though they're the Walmart of online shopping, hey... Walmart is okay sometimes, ya know?
Cafepress
Want something on a T-Shirt? Coffe mug? Underwear? Make your own merchandise for cheap!