Princess Cruises offers up to $1,000 Credit on 6-Night Cruises or longer as part of its Cyber Sale. Or, get Three Onboard Upgrades for free on Cruises from Summer 2017 through Spring 2018. Even better, get $100 off per person when you book a select Cruise with Airfare to Southeast Asia. (Prices are based on double occupancy.) Additional fees and blackout dates may apply. Book this travel deal by November 30.