Cruise.com via ShermansCruise offers a Carnival Cruise 6-Night Western Caribbean Cruise for Two with prices starting from $790. (Scroll to the bottom of landing page and click "Book Now" next to the September 2 sailing date.) That's the lowest price we could find for such a cruise in September by $48. This roundtrip cruise aboard the Carnival Miracle departs from Tampa, FL, on September 2. Additional fees and taxes may apply. Book this travel deal by July 31.