I have cost compared a lot.
Bananas-and organic are not too much more
Baby carrots - also organic isn't too much extra
Bag of gala apples
In season: blueberries, strawberries, asparagus, oranges
Some yogurts are cheaper there, some eksewhere.
Eggs
Milk (cheaper at Costco, but aldi is closer for my regular shopping)
Some of the frozen veggies
Canned black beans, pineapple, mandarin oranges, diced tomatoes, tomato paste
Salsa, honey, applesauce cups (large applesauce jars too).
That's all I can think of without consulting my massive spreadsheet!