All the best novel nominees are available as ebooks, but two don't seem to be in the Kindle Store.
Julian Comstock: A Story of 22nd-Century America by Robert Charles Wilson is available a some stores but not on the Kindle. Perhaps this is just an Agency model switchover issue.
The Windup Girl by Paolo Bacigalupi is from Night Shade and is sold DRM-free by Baen webscriptions.net. This is readable on a Kindle, but is only available from Webscriptions.