I’ve been using autoslash for several years as well as subscribing to their free newsletter which is filled with all kinds of savvy travel advice. When booking a rental (or even a hotel room), you simply send autoslash your confirmation number and if they find a better rate, they send an email notifying you of the opportunity to rebook. This week I saved 57% off the cost of the original quote on a car rental, same company (Hertz) and an upgraded car! This was a significant savings and rebooking was quick and easy. Just choose a “free cancellation” rate when booking, and after you’ve rebooked at the lower rate, just cancel your original reservation. There is no limit as to how many times you can rebook. Highly recommended autoslash