I live with my partner and a roommate and we buy at least 70% of our food at Costco. Frozen chicken breasts, ground turkey (which I break up and freeze in smaller portions), 2lbs of spinach, apples, bananas, almonds, yogurt, chicken stock, and bread. I like having large amounts of my staples at hand at all times. Plus, I save money. We supplement with a normal grocery store trip to pick up items we don't use all the time.
It helps keeps cost down, esp. since someone else pays our membership fees
