My favorite coupon deal site, The Krazy Coupon Lady, tracks coupon/sales matchups for several of the major national chains - Target, KMart, and Walmart, as well as some other large chains - CVS, Walgreens, and RiteAid. It also covers some small grocery stores that may or not may be local to your area.
One of my local grocery stores is included, and one is not. I have recommended this site to several friends in the northeast, and none of the local stores there are included either. Even if your local stores are not included, this site is still worth it for the national chains - and frankly those stores are where I do the bulk of my couponing. But what about your local stores? You'll need to start doing some research to find some good sites.