The public preview version of Scrivener is free to use until December 7. Any NaNoWriMo participants who achieve their goal of 50,000 words will qualify for a 50 percent discount off of the full version of Scrivener 2.0. Those who do not make the quota can get 20 percent off by using the discount code NANOWRIMO during purchase.
Scrivener 2.0 is US$45 for a regular license and $38.25 for an academic license. A registered owner of Scrivener 1 will be able to update for $25. Those who bought Scrivener on or since August 1, 2010 will be entitled to a free update.
Scrivener 2.0 requires OS X 10.4 or higher and remains a Universal application, but there is some extra functionality with Snow Leopard. The full version is expected to be released a week from today.