Saving money on your grocery bill is possible, especially if you're into couponing. According to the Promotion Marketing Assocation, Americans who use coupons save an average of 7 percent on their grocery bills. Let's say that you spend $200 a month at the supermarket, you would have an annual savings of $168. The problem: clipping coupons out of weekly circulars can be time-consuming, if you don't have a plan. So, what are your coupon-clipping strategies to help you save money on groceries?