Cruise.com via ShermansCruise offers a Carnival Cruise 6-Night West Caribbean Cruise for two, with prices starting at $738. (On the ShermansCruise landing page, scroll to the bottom and click "Book Now" next to the April 29 sailing date.) That's $10 under our mention from three weeks ago and the lowest price we could find today by $80. This roundtrip cruise aboard the Carnival Fantasy departs from Mobile, AL, on April 29. Book this travel deal by February 28.