Here is an example of a transaction you could do:
Pop Tarts are on sale for 4/$5.00
Use $1.00/2 coupon from the 6/13 and 7/11 RP
Makes them .75 a box.
Buy 4, use 2 coupons.
Some Kellogg's cereals are on sale 2/$5.00.
Use $1.00/2 coupon from coupons.com or Kellogg's site.
Makes them $2.00 a box.
Fruit Of The Loom Men's Underwear is on sale for $7.99 a 4 pack.
Use 1 coupon.
Buy 3 packs.
Total oop after coupons and sale will be $20.00!
PAYING WITH CHANGE!!
There are many other deals you could do combining sale and coupons. Buying other items, you will come out even cheaper.....