Cool Work Shirts?

RyuMaou asks: "I just started a job today and noticed I was the only guy wearing a golf shirt. Everyone else had long-sleeve button-downs on. So, I got home and went right to ThinkGeek to buy some Tux button-down collar shirts. But, horror of horrors, they were gone! Where can I get them, or others like them? I'd settle for the Geek.com propeller-head logo, but I'd really like Linux logo gear of all kinds. Anyone?"