edited - Target has a GREAT deal on Kellogg's cereal this week. Buy 3 boxes of select types & sizes starting at $2.66, get 1 free. Target has printable coupons for $1 off per box, plus Kellogg's has printable coupons that range from $1 off per box to $1 off per 3 boxes.
Buy 4 boxes of Kellogg's cereal for $7.98
Use 3 $1/1 Target coupons here (cash register wouldn't allow $1 coupon off free box)
Use 4 $1/1 Kellogg's manufacturer coupons here (you can only print 1 of each per computer so you may need multiple computers to get the combinations you want)
-$3.00 (Target coupons)
-$4.00 (Kellogg's coupons)
*I did recently find a blinky with coupons at Fred Meyer for $1/1 Fruit Loops & Apple Jacks which are included in the Target deal.