Royal Caribbean International is offering up to $200 onboard credit for new individual bookings made through July 31, for a five-night or longer itinerary departing between December 18-31. The credit is $100 for those who book an interior or ocean-view stateroom or $200 per balcony and suite-category accommodations.  Choose from 35 different sailings from 5-15 nights long with pricing starting at only $699/first and second in the cabin (plus tax).