How to use discount codes? Support August 18, 2022 20:08 Updated Once you get to the checkout page, enter the code in the “Discount Code” field and click apply. Related articles How to create a Gas Monkey Garage Account? What payment methods do you accept? The discount code didn’t work. My order is shipping to a country outside of the United States. Will I have to pay customs/import fees to receive my order? Can Gas Monkey rebuild/fix my vehicle?