Whether fresh or frozen, Costco’s fruit and veggie selection hosts plenty of fiber and vitamins, and are convenient for the price. Meg O’Rourke, RD-LDN, specifically likes Kirkland Signature Three Berry Blend. It is a great source of vitamin K, fiber, and antioxidants. “They are the perfect addition to smoothies, yogurts, or even my personal favorite, as a frozen treat for the summer,” she says. Find out more Kirkland items you should definitely buy at Costco.