I will note that I have a coupon in my coupon binder right now for $0.50 off a pomegranate, which my local grocery store will double to $1.00 - so yay for cheaper pomegranates! However, coupons like that don't come around often.
A thing you can do, if you find a product that you really like and don't ever find coupons for it, is to write to the company who makes the product and tell them how much you like it. For example, I like Muir Glen canned organic tomatoes. I wrote to the company, telling them how much I like their tomatoes and how they made it easy to make tasty, healthy dinners, and they sent me coupons for their product. It probably won't work with every company, but if you have some time and you want to tell people they're doing a good job, go for it.
My grocery store also occasionally sends out coupons based on what you buy, as tracked on your store loyalty card. My most recent batch included coupons for bananas, raspberries, ground beef, and mushrooms, all of which I will be happy to use.