If you have never been to A Full Cup.Com you should definitely give it a whirl! I use the site specifically for my store matchups. They have an awesome coupon database that allows you to look up coupons for specific products.
If you ever "think" that you have a coupon for something but don't remember where it came from or if it was one that you just read about and you want to see if you have it you can use the database to look them up. The database tells you what date the coupon came out, the expiration date, the product, the amount of the coupon and your can sort them all kinds of ways!
They do have other great information in each forum. There are forums set up specifically for various grocery stores, drug stores, national store chains etc.
People, just like you an me, are what makes up this gigantic forum of great deals and finds. If someone finds clearance items...they share the info...if someone sees a good deal online...they let you know.
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If you are a current member of A Full Cup be sure to let us know how this site helps you out!