Are you signed up for "Shop your way rewards"? It's free. It's the Kmart/Sears kickback program, and I get awesome coupons from them all the time... I looked, no furniture at the moment, but then, it's usually either a $off or #points-back kind of thing, rather than a %off. (I mean, you'd rather have 10% off than $3 off on a large purchase, kwim?)
Whether you find a coupon or not, DO make sure you're signed up before you buy something big like patio furniture, it's a minimum of 1% back, sometimes much more. ie-I got 10% back on a $40+ purchase earlier this month. Obviously, the ideal would be to get a sale price AND a kickback, good luck!