eBay has the adidas Men's Grind Polo Shirt (Black) for $12 with free shipping.
Amazon has the Under Armour Men's Tech Golf Polo Shirt (White/Graphite) for $19 with free shipping on $35+. Has excellent Amazon Reviews.
Nordstrom Rack has the DKNY Powerstretch Men's Straight Leg Pants (Olive) for $16 with free in-store pickup or free shipping $89+.
Amazon has the Up to 57% off Calvin Klein Underwear. Shipping is free with Prime or on orders of $35+.
Nordstrom Rack has the Zella Nylon Shell Hybrid Jacket (Navy Eclipse, M & L) for $14 with free in-store pickup or free shipping $89+. Lightweight and layerable.