Here are a TON of great resources for you! :)
Coupon Database! <<< Look for any coupon out there whether it was in Sunday's paper or is online to print :)
Manufacturer site sign ups for promos and exclusive coupons<< an ongoing list of resources from manufacturer websites
Then check out all these ;) ...
Printable Coupons and Catalina Rewards ($$ off OYNO)
All You Magazine has LOTs of manufacturers coupons each month I've seen $50-100 in value monthly
Score cash back on all your online shopping! $10 gift card for your first order.
Lowes Foods digital coupons
Where to find the Raleigh News & Observer papers (old list but still good info)