You can buy the shirts in any or all of the thirteen colors here, along with other wrestling-related products: gym bags, clocks, coffee mugs, etc.
The popular wrestling network also has a new feature. Members can now "Favorite" a wrestler (from among its 8000+ international wrestlers). Just click on the "Add Favorite" link on the upper right corner of the wrestler's profile page. His picture will then appear at the bottom of your profile.
Don't forget to favorite me (aka "kublakong"), probably the site's least active wrestler. (No, I don't wrestle, but you should have seen me forty years ago.)