Get 20% off your purchase online at Sports Authority with the coupon code FRIEND20 at checkout. Code valid through 7/21.. If you are in need of anything athletic you may want to hop on and check out what’s available. A lot of athletic clothes are on clearance. I spotted women’s Nike Tempo running shorts (my favorite) for as low as $14.99. This 20% off code applies to a lot of the discounted item so you can rack on the savings. In addition to that Sports Authority currently offers free shipping on Shoes, Clothes, Backpacks & Fan Gear. This free shipping offer is valid through 8/31.