CheapCruises.com via Dunhill Travel discounts select Carnival Cruises 3- to 7-night cruises with prices starting from $189 per person. Plus, bag up to $1,500 onboard credit, up to a $1,500 Amazon Gift Card, and pre-paid gratuities for free on select cruises. That yields low starting prices for Carnival cruises. Additional fees and blackout dates apply. Save on a range of itineraries, including Mexico, Caribbean, and the Bahamas. Book this travel deal by March 8 for cruises throughout 2019 and 2020.