As one of its daily deals, THAT Daily Deal offers this "Stand Back I'm Going to Try Science" T-Shirt
in Maroon for $4.99
for shipping. That's tied with last month's mention as the lowest total price we could find by $13. It's available in size S to XL. Deal ends today.
Note that size XXL is also available for 99 cents more, and 3XL for an additional $1.99.