All cruise prices are per person, based on double occupancy. The "3 For Free" sale runs through 11:

The  “3 For Free”  sales event not only includes free stateroom location upgrades, a free shore excursion credit and free onboard spending credit, but also features a refundable deposit of only $100 per person.
In port, a free shore excursion credit will give guests on Europe and Japan sailings $200 ($100 per person) to spend on shoreside tours such as a visit to the Hermitage in St. Petersburg or a stroll through dream hotel new york Kyoto’s Golden Pavilion in Japan. In Alaska, dream hotel new york guests will receive $100 ($50 per person) to spend on glacier hiking, dog sledding or other Alaskan dream hotel new york shore excursions.
In addition, those guests booking Europe or Japan cruises will receive up to $100 per stateroom in free onboard spending money and up to $50 per stateroom for those booking Alaska cruises and land and sea vacation packages, to use toward a relaxing massage, refreshing poolside dream hotel new york cocktails, or even limited 50th Anniversary keepsake items.
Guests can also book third and fourth dream hotel new york berth guests from as low as $199 and receive up to $100 bonus shore excursion spending money per stateroom and up to $50 bonus onboard spending money per stateroom.
All cruise prices are per person, based on double occupancy. The “3 For Free” sale runs through  11:59 p.m. PDT on Oct. 16  and is available to residents of the United States, Canada, Puerto Rico and Mexico.