BookIt offers 2-night stays for 2 at the all-inclusive Hotel Riu Palace in Cancun, Mexico, bundled with a $20 spa credit with prices starting at $515.22, as provided by Travel-Ticker. (If prompted, sign up for the free newsletter to see this deal; click on "Get this Deal" for complete details.) Assuming you use the credit, it's the lowest current rate we could find for a 2-night, all-inclusive stay for two at this hotel by $20. Book by February 28 for stays through October 25. Blackout dates and additional taxes and fees may apply.

Of note, BookIt offers stays in other hotels in or around Cancun with prices starting at $39 per night. Scroll down to see them all.