Proozy offers the Under Armour Men's Performance Long-Sleeve Tech T-Shirt in several colors (Graphite pictured) for $19.99. Coupon code "DN18" drops it to $18. With free shipping, that's a buck under our mention from two weeks ago and $12 under the lowest price we could find for a similar UA shirt elsewhere. It's available in select sizes from S to 3XL. Deal ends September 19.