One tip, I have said time and time again is not to buy a product just because you have a coupon. Especially if that product is not already on sale. When you combining a coupon with a sale you get the best benefit. This is not Extreme Couponing, but smart couponing.
This can also apply to if something is on sale, you have a coupon (or several coupons) and it is something you do use often. If you can get the rock bottom price, then by all means purchase that item.
The thing that gets most shoppers is that if they always buy Juicy Juice Apple Juice, reg. price is $2.99. On sale for $2, then if you have a coupon for $1/2. Which makes your Juice $1.50 and you have several coupons, purchase them. Because in a week or two.. you will be back at the store buying more and paying full price!
I hope these tips help.. happy couponing!
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