Safeway Kellogg's cereal deal

Buy four boxes or more of specially marked boxes of Kellogg's cereals (on sale for $2.49/box) and get $1 off each box automatically at the register. There are many Kellogg's Qs out there. Some are $1/1 box. Uses 4 $1/1 Qs on four boxes or more and pay 49c/box.

The Kellogg's brands marked $2.49 at my Safeway were:
Rice Krispies
All varieties of the Mini Wheats
Fruit Loops
Corn Pops
Frosted Flakes

There may be more varieties participating in this promotion.