My Mother was an saavy couponer. She dyed her hair "Dark Auburn". She would go from brand to brand depending on which company had a sale, coupon, and rebate. Every brand featured that color. We never paid for deodorant or toothpaste due to her couponing.
Back then we used to go to a store called "Rock Bottom." They went out of business (not our fault!) and since then I've used the same techniques at other stores. I currently go to CVS and Walgreens. They are right across from each other. Sometimes I go to just one, sometimes I go to both. Since I'm single, I only go there a few times per month and I buy mostly things like almonds, cereal, dish detergent, shampoo, hair dye, etc. I try not to hoard, but I do keep a small stockpile of things I use often.
I now use CouponMom.com and that saves me a lot of work. I file the coupons and just clip what I need when I need it. I don't like to pay retail if I can help it. I also use Online coupons.
I like to use coupons in combination with BOGO sales. I just got big cans of Bush's Vegetarian Baked Beans for 85 cents per can using sales and coupons. That's my favorite baked beans and I eat it for lunch with a slice of toast. I get 6 servings from it. It's a nice "fast food" lunch.
I try not to use too many convenience foods, but I do use some. Couponing is one important technique I use to keep down my food bill.