Weve been using Priceline for flights mostly. We used an Express Deal to rent a car to go to SFO. We assumed all the rental agencies will be located in SFO. There is a free AirTrain at SFO that goes to the main car rental building. Unfortunately, the deal we got was with Advantage Rent-A-Car, which is located offsite. Priceline was very helpful and understanding. We were able to cancel reservation, get a complete refund and make a new reservation with Budget.