Hobo Ninja offers this Star Wars–inspired Sith Life T-Shirt for $9.99 with free shipping. That's $5 under the lowest total price we could find for a similar Star Wars–inspired T-shirt. It's available in sizes S to XL. (Size XXL is available for a $1 more and XXXL for an additional $2.)
Also is available is the Sith Life Vinyl Decal for $3.99 with free shipping. It measures 4" x 6".