When at the supermarket, bring a little notebook with you, and a calculator. Write down all of your regular items (or something that you'd like to buy) and the price per ounce (divide the cost by the total number of ounces in the package). While the stores usually show that formula on the tags that show the prices, sometimes it shows "X" cents per ounce on one item, and "Y" per unit on another brand's item (that's why I suggested the calculator).
Get the same information from all the supermarkets that you frequent. After a couple of weeks, write out a chart of your regular shopping items down the left side of a page, with the name of the stores across the top. Then put the price into the proper column under each store. You'll quickly see what store gives the best regular prices, and you'll be better able to cash in coupons or take advantage of sales without pulling everything out of the cabinet to see what it usually costs.
Update the lists from time to time, too. I use Miracle Whip. It's usually $3.49 here, which works out to $0.10+ per ounce. I always buy it at a super-discounted grocery store for much less, $0.07 an ounce. When you get a coupon or there's a sale on, make sure that store is offering a better price than you often pay.
I used to take the cost of mileage into account, until a third supermarket opened recently within a 2 miles of my home. Talk about heaven! Soon you'll know exactly where to go to get what, simplifying a shopping trip and getting you the best price on everything.
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