Here are two more great reasons to clip coupons -- free products! By combining recent coupons with sales (a technique called stacking), you can score free Tylenol PM at Walgreens and free tomato paste at Walmart. Here's how it works.

Tylenol PM is on sale for $2.99 at Walgreens this week. Print out a $2 off 1 coupon when you register for the Tylenol calender. Also use the $1.50 off 1 coupon from the Walgreens March Coupon Book.

You have to ask a clerk for the coupon book, which is a long skinny booklet they usually keep behind the register. There are a limited number of coupon books and they only come out once a month, so remember to ask for yours at the beginning of each month. With these two coupons you'll make 50 cents on this transaction.

Then head to Walmart to get some free tomato paste. Muir Glen organic tomato paste is on sale for 96 cents a can. But if you sign up for the Muir Glen Connoisseurs Club, you will get a $1 off coupon for any of its products. That means the tomato paste is free.

Thanks, MoneySavingMom and The Freebie Blogger!