Looking for a last minute flight cross country. I went to Expedia, and the lowest cost was $580.00. I went on Priceline and the exact same flights with the same airlines were $330. That's Great. 24 four free cancellation, so no risk. Wanted to add a car from Hertz. Add $180: still OK. Had to cancel for personal reasons. Airfare refunded. Rental car was no refund, no future credit, no wiggle room.
Book the flight. Skip the car.