(I know it says “Today Only” but the offer is still good as of Tuesday)
Today only (Sunday, April 29th) Expedia is offering the Marriott Los Suenos Resort outside of Jaco, Costa Rica, for $109/night for a mountain view room. Rooms at the resort are regularly $329 for mountain view. From what I can see, the $109 rate is available through next April.
The rate is only available at Expedia — Marriott.com is showing $329. They should match you with their Best Rate Guarantee (details here). Assuming that works, you’ll get 25% off the $109, which makes this an enormous steal at $82/night.
I’ve been to the resort, and it’s beautiful. The main drawback would be the extremely expensive breakfasts (though there’s a supermarket right down the road if you wanted to pick up a few things and keep in the room instead of spending $25/person.)
(Thanks to this FT thread).