“In 2004, Nancy Giehl spent $12,000 on groceries for her family of five. ‘Now, I probably spend about $9,000 a year,’ said Giehl, of Boulder, Colo. What’s changed since then is Giehl, 48, now is one of the many ‘players’ on a Web site called The Grocery Game. For a fee of $10 every eight weeks, Giehl and other members get on www.grocerygame.com to use sales and coupons to their advantage.”