I believe Amazon has sold out all their stock and is awaiting more. But Barnes and Noble is showing shipment within 24 hours.

Of course, you'll have to make your Drupal Association donation separately then! :)

I've received some author copies of the book, which means it is off the printer and headed for distribution!

The book went to the printer last week. That means as soon as they can get it printed and into distribution it will be available.