At Kmart, buy a select pair of men's or women's athletic shoes and get a second pair of equal or lesser value for $1. (Eligible items are noted on the product page; the discount shows in-cart.) Choose in-store pickup to avoid shipping fees, which start at $5.75.
Of note, Shop Your Way Rewards members will earn a Kmart credit with this purchase and may be eligible for additional credits and discounts. Plus, Shop Your Way Max members are eligible for free shipping.