Carnival Cruises offers a Carnival Cruises 5-Night Caribbean Cruise for Two with prices from $718, as seen on Travelzoo. That's $10 under our mention from last week and the lowest price we could find for such a cruise today by $40. This roundtrip cruise aboard the Carnival Conquest departs from Ft. Lauderdale, FL, on September 3. Additional fees may apply. Book this travel deal by March 31.