Proozy offers the Under Armour Men's Sleeveless Fitness T-Shirt 3-Pack for $59.99. Coupon code "PZY3499" cuts that to $34.99. With free shipping, that's $32 under the lowest price we could find for six such Under Armour T-shirts elsewhere. (For further comparison, we saw a 6-pack for $60 a month ago.) They come in sizes S to XXL. Deal ends April 19.
Note that these will ship in random colors and fits.