When I was first married, many mango seasons ago, I was really diligent about cutting, sorting, filing & using coupons. One of our local grocery chains would have Double Coupon Day and that also helped these savings go even further. But now I find it's really not worth the time & effort. Most coupons are for such miniscule amounts, can't be doubled, and are for brand-name convenience foods, specialty cleaners, or health & beauty products I have no use for.
I save the most by shopping the sales at our Florida-based grocery chain Publix, they have fantastic weekly sales. I buy mostly staples & generics of those. Walgreens also has great sales each week. I try to stock up on necessary items when they're on sale, and let the sales direct my weekly menu.
I use the laundry soap recipe in post #7 of the above mentioned thread, and use the same proportions minus the Fels for diswasher detergent. I put 1 teaspoon in each soap compartment of my machine.
The thing that has helped me save the most $$$ is a small spiral-bound memo book & a pocket calculator I carry in my purse. I've marked the pages of the memo book A-Z and I jot down prices of certain items I need to track. Over time I've learned where the best prices can be found for different sorts of things. I've also learned that the big warehouse stores don't have the best deals on everything. The calculator helps me figure out unit prices and helps when comparison shopping.
For example, you can divide the price of Item A by its units, then multiply that answer by the units in Item B. Compare that answer with the price of Item B. If lower, then Item A is the best deal, if higher, then buy Item B. I also can learn just how much I would save by buying a larger or bigger package, sometimes the savings is so minimal it's not worth handling the surplus.
I wish there were a website where you could just type in your grocery list & it would find coupons you could print wherever available.