As one of its daily deals, Hobo Ninja offers this "3 Out of 2 People Struggle with Math" T-Shirt
for shipping. That's tied with last month's mention and $7 less than the lowest total price we could find for a similar T-shirt elsewhere, although we saw this one for $4 less last spring. It's available in sizes S to XL. Deal ends February 25.
Note that size XXL is available for an additional 99 cents and size 3XL for $1.99 more.