Get creative at the salad bar
We know that the lighter the item at the salad bar, the less it costs. Be smart about what you're getting. There are hidden gems that are worth way more than their weight -- bacon, for one. If you go during breakfast, bacon is airy as hell. You're basically getting it for nothing. Put the dressing on the side. Skip the tomatoes, they're mad heavy. Water weight, friends.
Buy 365 all day, every day
Many 365 products are competitively priced compared to the organic brands of other supermarket chains, but that's not what separates them from the pack. There are certain 365 products that, for the price, are the best in class, like the salsa, tomato sauce, pita chips, and even non-foodstuffs. The soap is excellent, and fairly priced. I go for the big ol' soap refill bottles, and they give me weeks of pleasant-smelling stuff that's good for the environment and my dainty, feminine hands.