Pull out all your high value coupons - worth up to $2 - and bring them over to your local Kmart store to have them doubled. The list of participating stores is here. Use your Shop Your Way rewards card, which you can obtain free, and you can redeem up to 5 coupons at a time per day to be doubled.
That means your $1.50 coupon is worth $3 off, and your $2 coupon is worth $4. With those savings, it's probably worth driving a tad farther to get to Kmart. Super Doubles are in effect through Saturday, 4/10/10.