Buy 6 cans, $1.00 each, and use the coupon for $1.00 off 3. Those coupons get doubled so you're paying $2.00 for 6. Then there's a printout (at least at my store) for $4.00 off your next order.
But the coupon came out Sunday and expires today.
Sorry I didn't mention it earlier... I had been on vacation.