On Saturday morning, my son and I got dressed, packed my bag with a calculator, Seafood Watch’s Pocket Guide and the Environmental Working Group’s Wallet Guide to the Dirty Dozen and the Cleanest Fifteen , my cell phone for last minute customer service calls and a pocket book of cash. We headed thirty miles down the road to the next town over where all the big grocery store chains are located to start shopping. Week 1: $67.67 2 Crowns of Organic Broccoli S : $1.98 10 lbs Conventio