-First sign up for a free Emeral club account.
-Register for the 2 1 free promotion
-Rent two 2 day(min) rentals and receive 1 free rental.
-If your unfamiliar with the National Car rental's frequent user club called "Emerald club" find more info here.
-One of the main benefits of the "Emerald Club" is being able to select whichever car you want from the "Emeral Aisle" when reserving a midsize or higher.
-The emeral club also allows you to bypass the counter
-In addition to the 2 1 free promotion you'll receive one free rental with every 7 rental credits.
-You can receive additional discounts by finding coupons here
-If you have Elite statu with either Hertz/Avis National will match it here