To go along with Sheldon's Violet Lantern, Red Lantern, plethora of Green Lantern, and all manner of his lamp-themed t-shirts, here's his long awaited Yellow Lantern tee. The one sold in the Amazon link below isn't exactly like the one we see Sheldon wearing in the photo above as it's missing the subtle design inside the logo. Other than that (arguably important) feature, it's a dead-on match.
Featured on The Big Bang Theory episodes
S07 E07: "The Proton Displacement"
S07 E17: "The Friendship Turbulence"