Vacations to Go offers a Carnival Cruise 6-Night Western Caribbean Cruise for Two bundled with a $150 onboard credit with prices starting at $798, as provided by Dunhill Travel. Assuming you use the credit, it's the lowest price we could find for this cruise by $150. This roundtrip cruise departs from Fort Lauderdale, FL, on May 18 with stops in Key West, FL; Grand Cayman, Cayman Islands; and Cozumel, Mexico. Some restrictions may apply; fees, government taxes, and fuel supplements are additional. This travel deal ends April 8.