As one of its daily deals, THAT Daily Deal offers this Grumpy Kitty, Angry Kitty T-Shirt for $5.99 plus $2.99 for shipping. (Hobo Ninja charges the same via coupon code "IWILLSHAREHOBONINJA".) That's tied with our April mention and $10 under the lowest total price we could find for a similar grumpy cat-themed T-shirt elsewhere. It's available in sizes S to XL. Deal ends today.
Note that size XXL is also available for 99 cents more and 3XL for $1.99 more.