Shop smart when you're buying in big quantities, she advises. "Items like toilet paper, dishwashing [soap], laundry detergent and trash bags aren’t a problem, but they could be found cheaper by using a service like Amazon Subscribe and Save," she says. "It offers free shipping to your door, and I found is very competitive in price to the warehouse store. It also saves the membership fee." For perishables, Liz Dierking and Jenny Andrews of the tastytrade Financial Network suggest splitting your bulk shopping with a friend or family member so you won't end up tossing unused or expired items.