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You can book a specific or an unspecific (open date & destination) future cruise on-board with a $100 per person deposit. You have 4 years to book the unspecific cruise with a travel agent or Princess. With any on-board booking you get on-board credit for the future cruise. If you book a 7-9 day cruise you get $25 pp for inside or $50 pp outside, 10-15 cruise $75pp for inside or $100pp for outside, 16+ days you get $125pp for inside or $150pp for outside.