With very few other retailers offering layaway programs, Kmart has a point of difference in the market. Now, the retailer is looking to draw even further attention to that difference and bring in new customers by promoting a 5 percent discount on layaway purchases made for back-to-school. To qualify for the discount, Kmart customers put down $15 or 10 percent of the purchase amount, whichever is greater, and pay a $5 fee. The offer is good until August 18. The program is also available to online shoppers.