Do you just buy food when you go shopping for groceries?  And what I'm talking about that you shouldn't buy are things like batteries, appliances, light bulbs, stuff like that.  You will be wasting a lot of money due to the fact that most, if not all of those items and more will cost you much less at The Walmart, The K-Mart and other box type stores.  Here's a list of at least 5 things you should never buy at the grocery store:

5 Things Not to Buy in a Supermarket on Shine.