I'm not much into coupons, but I do watch the sales. Right now, with prices rising faster than a kite on a windy day, shopping the sales is the smartest way we can buy food.
If you can get the wheel turning right, you never have to pay full price for most of your food. Even if you don't have much to spare, you can still stock up a little every time (even $5 worth will help) there's a good sale, and you'll have the product next time you need it - at sale price. If you do this constantly, you'll soon have a pantry full of products bought on sale and you can "pantry shop" (choose what's in your pantry rather than what's in the store) before going to buy groceries. That cuts way down on what you need to buy.
Shopping the sales sounds like a complicated job, but it's really not. Most newspapers run grocery store ads midweek, so that's a start. Not every store puts in their ads, though, and not everyone subscribes to a newspaper. Cheaper and easier: Find the sales online. Most grocery stores have weekly sales listed for your area. You still have to go and hunt down each store, but it's cheaper than a newspaper subscription and you don't have to wade through paper ads scattered all over the table.
Even better than spending a lot of time going to individual sites and looking up the ads, there's a place where you can find them all at one time, faster and easier, with a couple of clicks.
MyGroceryDeals.com really does deliver the sales ads. They've recently had a site facelift, so if you've been there before but had trouble with navigation, you'll love it now. It's all out and upfront so you can see where you want to go and get there right away.
They've added nutrition information and (what can be really helpful!) allergy popups that tell you when you're choosing food that contains whatever allergen you've put in your profile. Super neat.
And, no, I don't get paid to say this; I think the site fills a need we all have: getting the best deal for the best price for the least effort. Can't beat that.