Well, it's just something I did for fun then it turned a bit addictive :/ It's all started when I was giving my friends some of these shirts we made for fun then I have no idea how but they started to introduce the shirt to other people.
I believe there are some bronies out there looking for t-shirt as well, so yes, it's on sell. There are only a "few copies" of these shirts left apparently that's because I'm not on the mood to start a serious business at the mo XD
You can find copies of this shirt on Ebay (size F which is between M and L UK SIZE)[link]
For more sizes please give me a shout, we ship them worldwide without costing you one bit of shipping cost
Or if you want a custom one it's also on Redbubble aswell [link]
Any question please send me a note, be happy to answer them all