Carnival Cruise Lines offers several different low prices for different cruises as follows: 1. $699 for 3 Night Bahamas Cruise. 2. $849 for 4 Night Western Caribbean Cruise. 3. $849 for 4 Night Bahamas Cruise. 4. $1,019 for 5 Night Bahamas Cruise. 5. $1,019 for 5 Night Key West & Bahamas Cruise. 6. $1,039 for 5 Night Eastern Caribbean Cruise. And many more.