Vacations to Go offers a Carnival Cruise 4-Night Western Caribbean Cruise for Two with prices starting at $578. (If prompted, sign up for the free newsletter to see this deal.) That's the lowest price we could find by $40. This roundtrip cruise aboard the Carnival Glory departs from Miami, FL, on March 26 with stops in Key West, FL, and Cozumel, Mexico. This travel deal ends March 14.