YaptaFree: All time

Ever booked a flight ticket then found out later on that the price had dropped? Well, this may be helpful for you to know that all U.S. airlines allow you to get a credit for the price difference. And to save you the hassle of having to keep tracking the price changes, the website Yapta does the work for you. Their tagline “Price drop. We alert. You save” says it all. So you no longer need to cry over spilled milk. It all can be undone. Furthermore, Yapta is also available as an iPhone app.

Website: www.yapta.com

Photo credit: Yapta