Bok Choy Apparel [website] is a US-based indie T-shirt company founded in 2008 which “seek to foster the growth and expression of fellow Asian Americans by promoting their art and designs in cool graphic tees.”
The company also provides support for various non-profit groups, including its latest mini-campaign to raise funds for the Japanese earthquake relieve effort.
Not sure if they send their products internationally though. And I think some of the designs posted here are already out of stock.