• Never shop when you are hungry. This leads to impulsive buys which are usually high priced convenience items.
• Shop from a list and stick to the list.
• Avoid shopping when tired because this leads to purchases of food with high sugar content and lots of carbohydrates.
• Foods that are more expensive tend to be at eye/chest level. Look higher or lower on the shelves for the best deal.
• Compare the price per unit (oz, lb, fl.oz) instead of the overall price.
• For meat, compare the price per serving instead of the price per pound.
• When you see the sign that says 5 for $5 do you have to buy all five items to get the discount or is each item priced at just $1? If there is a minimum purchase it will usually say. Many stores advertise this way to get you to buy more. If you don't really need 5 of that item then you can save money just by buying 1 or 2.
• Some grocery stores will price match. Wal-Mart is great at this. If you take in the ad from another store they will honor the lower price.
• Shop at larger stores because you will be able to get a better price than say a convenience store.

These are just a few ideas and I'm sure there are many more. How do you save money at the grocery store?