A 29 year-old mom of two is saving her rural Kansas community millions of dollars a year by sharing her weekly grocery list in an online spreadsheet.

By day Emily Graves is a typical working mom. But her creation of a shopping list that compares sale ads has turned her into a retail rock star.

"The comp list is a spreadsheet of all the deals from local grocery stores. I look up ads from 25 different stores and find the best deals for the groceries," Graves explains.

The gold nugget is the fact that she can get all the deals at one store by using their low-price guarantee  — and anyone can do it in their own town.

(READ the story in Yahoo!)