Expedia via TripAdvisor offers 3-Night Stay at Lime Tree Bay Resort in Long Key, FL, for $484.02, as provided by ShermansTravel. (It's the first offer on the landing page; we found this rate on June 3.) At $161 per night, that's $54 off and the lowest price we could find. This 3-star hotel has an Expedia rating of 84% based on 561 reviews. Book this travel deal by February 28 for stays through June.