Also available is the Tru-Spec Men's 24-7 Series Long Sleeve Uniform Shirt in five colors for $18.99. Add three to your cart and the price falls to $40. With free shipping, that's $13.33/shirt and the lowest total price we could find for three of these shirts by $47. They're available in regular and long sizes from XS to 3XL, although not in all size/color combinations.
Of note, you can't mix and match the long sleeve and short sleeve shirts.