Grocery Delivery

Delivering groceries through the store itself wouldn't be possible because these stores make money when people come in to buy.  However, I believe I could operate a business that takes orders online and acts as a pickup service.  We'd charge a small % fee as well as a flat rate delivery fee.  The business would promise delivery by 5pm on any order placed by 1pm that day.  I believe the market for this business is there because people today have very little time but are becoming more and more conscious of the health problems with eating fast food.