Nautica is offering an Up to 75% off A Variety of Men's, Women's, and Kids' Styles as part of Nautica Spring Clearance. Shipping adds $8, or get free shipping on orders of $50+.
Dick's Sporting Goods is offering Up to 50% off Dick's Sporting Goods 1-Day Flash Sale. Includes a wide variety of activewear, sporting goods, and outdoor items. Shipping adds $5.99 or get free shipping on $25+; free curbside delivery is also available.
Amazon has the Under Armour Train Men's One Panel Hat (Graphite/Stealth Gray, Medium/Large) for $13 with free shipping on $25+ or with Prime. Its made with UA Siro CoolSwitch fabric and has coating on the inside that "pulls heat away from your skin.
Has good Amazon Reviews.