Ordering instructions for the Buy 5 get 1 FREE: Step 1..order 5 quarts or 5 air freshener units (can't mix qts and units to get 5....5 qt get 1 qt free....5 units get 1 unit free Step 2..Check out Step 3..At the bottom of the check out page, type your free choice in the comments/special delivery instructions box. Example: free qt mulberry, or free unit elec white. Don't worry, we process each order and would catch any mistakes.