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Cruise.com via ShermansCruise offers a Carnival Cruise 5-Night Mexico Cruise for Two, with prices starting from $648. (Scroll to the bottom of the landing page and click "Book Now" next to the April 7 sailing date.) That's the lowest price we could find for such a cruise by $40. This roundtrip cruise aboard the Carnival Valor departs from Galveston, TX, on April 7, and includes stops in Cozumel and Progreso, Mexico. Book this travel deal by February 28.