As one of its daily deals, HoboNinja offers this "3 Out Of 2 People Struggle with Math" T-Shirt
for $9.99. Coupon code "IWILLSHAREHOBONINJA" cuts it to $5.99
. With $2.99
for shipping, that's the lowest total price we could find for such a shirt by $12. It's available in sizes S to XL. Deal ends March 15.
Note that, after the above coupon, size XXL is available for an $6.59 and size 3XL for $7.19.