I saw the second one at Walmart the other day too! Also saw one with G4 Applejack that was just the top of her head peeking up from the bottom. It said "Hello" or "Hi" or something. There was also a very generic Princess Celestia tee. It was one of her common vectors with her name. I should have taken a picture of them.
I didn't see the Pinkie Pie one though! Surprised to see they spelled her name wrong.
The design is really cute. I love that sort of fake comic-y pop design.