Sports Authority: 20% off a Single Item (Today Only) by Dana Zeliff on October 22, 20122012-10-22in Coupons, Retail Deals Disclosure: This post may contain an affiliate link. Today only, get 20% off a Single Item online at Sports Authority. Choose from clothes, shoes, accessories and more. Discount will automatically be taken at checkout. *Not available with other offers. Some exclusions apply.