As one of its daily deals, THAT Daily Deal offers this Save the Narwhals T-Shirt for $5.99 plus $2.99 for shipping. That's tied with our mention from two weeks ago and $12 under the lowest total price we could find a similar t-shirt elsewhere. It's available in sizes S to XL. Deal ends January 30.
Note that size XXL is also available for 99 cents more and 3XL for $1.99 more.