As one of its daily deals, That Daily Deal offers this You Are Turtley Awesome T-Shirt for $9.99 with free shipping. That's tied with our December mention and $12 under the lowest total price we could find for a comparable T-shirt elsewhere. It's available in sizes S to XL. (It's also available in XXL for $11.88, or 3XL for $12.48.) Deal ends March 31.
Of note, a matching Vinyl Decal is available for $3.99 with free shipping. That's $21 off and another price low.