Proozy offers the Under Armour Men's HeatGear Flyweight T-Shirt in several colors (Black/Steel pictured) for $19.99. Coupon code "DN1399" cuts the price to $13.99. With free shipping, that's tied with our mention from two weeks ago and the lowest price we could find by $14. It's available in select sizes from S to XXL. Deal ends January 8.