回複：Expedia 有 Best Price Guarantee

隻在24小時之內.偶爾有用。

http://www.expedia.com/daily/highlights/best-rate-guarantee/default.asp

Expedia guarantees you're getting the best price. If you should find a better price online for the same trip within 24 hours, Expedia will refund the difference—and give you a travel coupon worth $50.