My sisters and I will often buy bulk items and split it and the cost between us, 10 pounds of potatoes would be much too much for just DH and I. But split 4 ways it's just enough. When one of us sees a bargain, we'll call the others to see if they need or want to share.
Recent bargains: 5lbs sharp cheddar cheese: 10.50 (5.25 split with one sister)
25lbs organic long grain brown rice: 23.00 (Split 3 ways)