If you're not familiar with "stacking" - it is a great way of combining a store coupon with a manufacturer's coupon to save additional money. If you take that combination and add it to a store sale... JACKPOT!!
Some grocery stores, drug store chains and big box stores offer store coupons.
A few weeks ago I went to Target and stumbled on this great deal:
Target had a sale on L'Oreal Hair Color
I had a Target coupon + a Manufacturer's coupon
The Target coupon was actually for $2 off (misprint from the Target website).
My total out of pocket was $1.99 each - plus tax.