I looked at the tee shirt site from the link and although the tee shirts were gorgeous, I noticed they were shipped from Australia, which made it doubtful that the sale would benefit any Native Americans.

Here's one of the beautiful tee shirt designs from the Hopi Market, which offers a wide range of locally crafted items priced from around $20 and up. The kachinas are authentic and even some of them are relatively reasonably priced. Take a look by clicking on the eagle.