These are a collection of coupons sites (many have free samples too). Some you may need to register at:
All You Magazine Printables
Earth Fare Healthy Savings Coupons
Eat Better America
Healthy Living Coupons
Mindful Mama Coupons
Redplum – print online coupons
SmartSource – print online coupons
Upromise – Automatically load grocery coupons onto your frequent shopper card at a variety of stores. A powerful tool for saving for college or paying on any student loan.
Vocalpoint – they send samples to you in the mail as well as coupons.
Whole Foods Printables