Another tip to saving money is stocking up on items you use regularly when they are on sale. Not that you have to buy a bunch but just one or two extra. Sales usually run in 12 week cycles so if you have enough to last until the next time it comes on sale. If you have an extra of items on hand then when you run out you don't have to go pay regular price for it.
If you look through the weekly store ads and notice things that are on sale that you use regularly. Alot of times if you have a coupon for an item and it is on sale you can get it for free or almost free. Another tip is matching coupons to items on sale. Lately, there haven't been many coupons in our local newspaper so this one doesn't work very well now.
Some people say they don't have time to look for sales. It doesn't take very long to look through the fliers. If you get in the habit of doing it, it will get easier.
I have been picking up items when they are on sale and it has cut down on my trips to the store lately. I usually just need to buy milk, produce, etc. It is different since I am single, but even with a family you will cut down on your trips to the store. With cutting down the number of trips to the store, you will also cut down on impulse buys.