Use Amazon Subscribe and Save to get six 15-ounce boxes of Life Cereal: http://www.amazon.com/Life-Cereal-15-Ounce-Box-Pack/dp/B001E50U
for $12.08. Free shipping via the Subscribe and Save program and/or FSS.
I just got back from Ralphs where a 15 ounce box was $5.89!