Cruise.com via ShermansCruise offers a last minute Carnival Cruises 4-Night Mexico Cruise for Two with prices starting from $298. (On the ShermansTravel landing page, scroll down and click “Book Now” next to the January 21 sailing date.) That’s $70 under our mention from a week ago and the lowest price we could find now by $50. This roundtrip cruise aboard the Carnival Inspiration departs from Long Beach, CA, on May 7. Additional fees may apply. Book this travel deal by January 20.