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Cruise.com via ShermansCruise offers a Carnival Cruise 5-Night Cozumel Cruise for two, with prices starting at $618. (On the ShermansCruise landing page, scroll to the bottom and click "Book Now" next to the February 4 sailing date.) That's the lowest price we could find for such a cruise by $20. This roundtrip cruise aboard the Carnival Fantasy departs from Mobile, AL, on February 4. Book this travel deal by January 31.