I was in a japanese clothing store in NYC this weekend, called Uniqlo.
They have all sorts of t-shirt designs "inspired" by anime and video games.
Tons of neat shirts that have Gundam, Casshern, Tekken, Pac-man, Space Invaders, Detective Conan, Speed Racer, all kinds of different stuff.
And when I say cool, I actually mean it. They're not the cheap screen print anime/video game shirts they sell at Hot Topic for 20 bucks.
I picked up 4 of them and it only cost me $45, so check it out.