Cruise.com via ShermansCruise offers a last minute Carnival Cruises 4-Night Mexico Cruise for Two with prices starting from $398. (On the ShermansCruise landing page, scroll down and click "Book Now" next to the January 13, 2019, sailing date.) That's the lowest price we could find by $200. This roundtrip cruise aboard the Carnival Imagination departs Long Beach, CA, on January 13, 2019. Additional fees may apply. Book this travel deal by August 31.