The blue T-shirt, which read "The Expert" on the front, is sold out on retailer J. Crew's website.
"We're sorry. This item has been so popular, it has sold out," read a message on the store's website.
The T-shirt retailed for $29.50.
However, it looks like Barron's T-shirt has managed to become a source of debate. Sarah Palin's website claimed that it was Barron who contributed to the shirt's sellout. However, Business Insider delved deeper into J. Crew's catalog, and found that the T-shirt was from the Spring 2015 collection, and was already sold out.
Hannah Abrams is the senior content editor for Promo Marketing. In her free time, she enjoys coming up with excuses to avoid exercise, visiting her hometown in Los Angeles and rallying for Leonardo DiCaprio to win his first second Academy Award.