Long cruises are expensive, so it's natural to want to find the best deal possible. The around the world cruise is also very popular and there is a limited supply. They don't come cheap. Regardless, there are ways find a good deal.
Timing is the most important factor. World cruises open for booking about 18 months before the departure date, and fans reserve cabins right away. Early booking gets you the best choice of staterooms and can also bring significant perks. Onboard credits, free airfare to the departure port, and complimentary shore excursions are typical of incentives offered to those who book early.
The other way to use timing to your advantage is to try to snag a last-minute cruise deal. If the ship isn't sold out 60 days before sailing, the cruise line is likely to offer discounts on the remaining cabins. The selection will, of course, be limited. If you are flexible and willing to gamble, waiting for a last minute deal may make your dream world cruise affordable.