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I'm booked on the Grand Princess Med Adventurer 1 Aug 2009. Booked in May 2008 and the price hasn't changed in all that time. If you wait you may miss out altogether but if there are cabins unsold they'll be at a better price. I guess it depends on whether you are prepared to gamble on missing out and going on a different cruise later (depends on your flexibility) or if you want to guarantee your cabin now.