Car rental 50% Discount

I never been to Maui yet though its just a 30 minute flight from Oahu. My hubby was raised in Kauai so we often go Kauai but we always planning to have a short escapade to Maui. I'm sure pretty soon he will just tell me to pack up and fly to Maui and just have a car rental when we get to Maui airport. I have search already about a car rental at Maui and Advantage car rentals have a great 50% discount on Luxury and Convertible car rentals. I like convertible and feel the summer heat while touring around the island of Maui.