Here's an idea, and while I was skeptical about this at first, I'll tell you it works!
Write to companies!
Do you use Ore-Ida frozen products (i.e. potatoes) - send them an e-mail through their website with a comment (compliment or complaint) and they will mail you coupons! I received 15 different coupons from them, for everything from Frozen Potatoes to Heinz Ketchup (Ore-Ida is a Heinz company). Well worth the 3 minutes it took to draft the e-mail.
This has also worked for Kotex. Still waiting on others that I've contacted - but so far I'm batting 1000!!
What can it hurt? Send an e-mail to your favorite brands and see what coupons they come up with for you!