$1.25 Kellogg's Cereals at Shopper's, 02/12-02/18, and $0.75/box at Safeway,

At Shopper's Food Warehouse:
Multiple Kellogg's cereals are listed in the coming week's ad for 5/$10, or $2/box.

You can get 2 boxes of Apple Jacks, Corn Pops, and/or Frosted Flakes for $2.50, or $1.25/box, by using the 01/18 RP Sunday insert coupon for $1.50 off of two boxes of these cereals.

The same insert (01/18 RP) has a coupon for $1.50/2 Smart Start, Rice Krispies, Crispix, Raisin Bran Crunch, Corn Flakes, and/or Raisin Brand cereals, so you can probably get some or any of these for $1.25/box, too.

At Safeway starting 2/11, Kellogg's Frosted Mini Wheats are $0.75/box as follows:
You can use the same 01/18 RP $1.50/2 in combination with the Safeway advertisement Super Coupon (which makes them 4/$6).
Thanks, Gina of Mommy Making Money, for the alert on the Safeway deal!