This Outer Banks Diamond Knit Men's Polo Shirt drops from $9.71 to $7.77 at Sierra Trading Post when you use coupon code ACAHIKE3 at checkout. Shipping is $5.95. This the lowest price we found by $12. The short-sleeve shirt is made from Egyptian cotton and is available in five different colors, each with white piping on the collar, in men's sizes S to 2XL (not all colors are available in all sizes). Sales tax is not charged in most states.