Reservations.com saved my about $300 in 10 minutes. I was at the airport and decided at the last minute to book a car rental. They wanted $49 per day and I said, I saw online that the rates were cheaper... the guy told me too bad, this is the price at the airport. I then went on my iPhone, navigated to Reservations.com and booked the same exact car for $23 a day. Went back to the guy, showed him my confirmation phone number on my car and walked away saving $300. Thanks