Any cheese, we love the parm, Tillamook extra sharp cheddar, and boursin.
The Harris Ranch products in the heat and serve area are excellent, as are the Main Street Bistro Mashed Potatoes. Makes an excellent quick meal on busy nights when you crave comfort food.
The Kirkland vanilla, and their no-salt seasoning is very good.
Their produce is always excellent - we buy apples by the case, grapes, baby cucumbers, and romaine hearts regularly.
I agree with Lana, we wouldn't live nearly as well without Costco.