If you need a car in the US on short notice, several major rental companies often roll out discounted “last-minute” offers to fill unused inventory — even on the same day. For example, Avis advertises savings up to ~35% when you select “Pay Now” and offers occasional flash-sales and free upgrades. https://www.carhelpcenter.com/blog/best-last-minute-car-rental-deals-in-the-usa-today