Just a heads up - they probably won't take it!
I attempted to use this coupon last night. According to that strong-willed cashier, KMart has been instructed by corporate not to accept any printed coupons (whether they were from their OWN WEBSITE or NOT). Too much fraudulent use, apparently. I can understand if they choose not to accept any printed coupons - however, they should consider removing them from emails/their website and discontinue issuing them in that case.