At Kmart, buy three men's, women's, or kids' spring tops or tees and get a fourth for free. (Eligible items are marked on the product page.) Plus Shop Your Way Max members bag free shipping. (Not a member? It's free to sign up for a 90-day trial; otherwise, shipping starts at $5.75. Free in-store pickup is also available.) Deal ends April 19. Some best bets, with prices before discount: