via ShermansCruise offers a Carnival Cruise 5-Night Mexico Cruise for two, with prices starting at $598. (Scroll to the bottom of the landing page and click "Book Now" next to the August 20 sailing date. That's the lowest price we could find for such a cruise in August by $220. This roundtrip cruise aboard the Carnival Fantasy departs from Mobile, AL, on August 20 with stops in Cozumel and Costa Maya, Mexico. Book this travel deal by July 31.