Car Rental Coupons for Discount Rental Cars | Avis Car Rental Yes! Avis coupon codes are offered all year round. At Avis, we help you get the best car rental discounts with coupons that help you save and upgrade. Find the best discount code for your upcoming car rental. Save on your reservation today! How can I get a discount on a rental car? Use the car rental coupon codes below to save or upgrade your ...