Buy 6 Kelloggs Cereal $1.88
$1.50/2 – Kellogg’s Frosted Mini-Wheats – (coupons.com)
$1.50/2 – Kellogg’s Cereal, various varieties – (redplum.com)
Final Price: $6.78 for 6 boxes of cereal and 2 catalinas for 2 gallons of milk free!

The free milk should be bought in the transaction right after you buy the cereal, because buying the cereal will trigger the catalina’s for the 2 free milks!