Shirts are $15, and if you are interested, they can be purchased online at: https://tamu.estore.flywire.com/products/texas-am-math-t-shirts-291882 and picked up by bringing your receipt to BLOC332 (or reaching out to one of our officers).
The design can be found here: https://github.com/lucianchauvin/ATM-Shirt and we also have some of the old designs left over which can be seen below.