If your store doubles then here is a great coupon for Breakstone Sour Cream. Go here to get a $.55/1 coupon.
Right now at ShopRite:
Breakstone Sour Cream $.97
Final Price: FREE
Here is a tip if you are buying a lot of sour cream. Sour Cream does not freeze well. Yuk! Store it upside down in the frig. It lasts much longer.