Keep the husband and kids home. You will spend less money. Don't trust the scanners at check-out counters. They make mistakes. When possible, know the prices of what you are buying, and watch it scan.
Many stores have the policy to match their competitor's prices.
If you see something in the newspaper that you want, but don't want to travel to that particular store to get it, cut the advertisement out and take it to your local store. Shop the thrift stores with regularity. Know which ones have the best prices. When buying a non food item, always look in the back to see if you can find the identical item marked at a lower price. Often when prices increase, it doesn't apply to the items already marked.