It's been A VERY LONG time since Kmart has doubled coupons up to $2 in value. I believe the last time was August of 2009. Well for 3 days only, Kmart will be doubling coupons from 12/5-12/7. You must spend at least $25 from food and drugstore. Only 5 coupons per person per day will be honored. You must present your "Shop Your Way" rewards card. This can be obtained from the service desk.
It doesn't really seem worth the drive, unless you live close to a Kmart. You should be able to get a lot for free or pretty close.