To add more to the tee shirt talk. We have another website that kills it with tee shirts. That is crazydogtshirts.com.
They have a sale for buy 2 tees get 2 free, but its a one day sale. The internet hates one day sales but Twitter seems to love them.
I will say from a brief view of their website they have some cheesy tees. More for teens. So if you have a younger sister or brother, good gift ideas.