$1.16 Cheerios

I scored 12 boxes of Cheerios for $14

Cheerios were on sale 3 for $5 (or $1.67 each).
12 boxes = $20.00
I used 6 "Buy Two, Get $1.00 off" coupons (from http://www.thecouponsclippers.com/)($6 savings)
Total: $1.16 per box