I still have a pretty decent amount of both 2014 and 2015 shirts hanging around. I'll be in my team's pit most of the weekend (Team 4329, in the Hopper Division). Come find me if you're willing to do a trade! If I'm not there, ask someone for our team's captain and be sure to mention something about a shirt trade.
Again, you can check out the shirts here:
http://imgur.com/a/5JJhu