Cruise.com via ShermansCruise offers a Carnival Cruises 4-Night Mexico Cruise for Two with prices starting from $386. (It's the second offer under the Cruise.com tab on the landing page.) That's the lowest price we could find for such a cruise by $40. This roundtrip cruise aboard the Carnival Imagination departs Long Beach, CA, on January 27, 2019. Additional fees may apply. Book this travel deal by December 31.