Use Yapta when you are planning a plane trip. The site will send you an alert when the cost of a plane ticket to your destination drops so that you can book the cheaper flight and get refunds and credits from the original airline you booked. Yapta will also keep track of car rental rates, alert you when you can get a lower rate and rebook your rental car. http://www.yapta.com/ Bonus idea: Estimate what you have saved and put all or at least some of it in your savings account.
Save Money on Plane Tickets and Rental Cars