Currently TripAdvisor is offering a FREE $25 Amazon Gift Card when you book and review your stay (minimum of $200 before taxes and fees required). Note that Mariott brand hotels are excluded from this promotion.
Just head here and book your hotel between now and October 3, 2016 (must spend a minimum of $200 before taxes and fees) on TripAdvisor.com using a valid US address. Be sure to complete your stay and submit your review by November 14, 2016.
Once your review is published and TripAdvisor has confirmed your stay, you should receive an email with the code worth $25 to use on Amazon.