More to explore:
Kansas City price match list--- free weekly; many cities
Best Way to Grocery Shop! Price match!
Price Matcherz, they put all the grocery ad's together so you can find all the best prices! Awesome Site!
PriceMATCHERZ is the ultimate grocery price matching tool. They look through the weekly grocery ads in your area and compile a list of items that they believe to be better than the current Walmart price. They also have tons of printable coupons!
Tucson Ad Match. FREE! You can find your city here too.