For those looking to preorder, The Long and Dark Kindle eBook is now up at Amazon.com. Regular price is $2.99 or free if you already subscribe to their Kindle Unlimited service.
For those interested in the trade paperback, it will also be available on (or before) October 29th. If you purchase the paperback from Amazon, you will have the option to add the eBook for free to your Kindle library.
For retailers, the trade paperback will also be available through IngramSpark and should show up in the next Ingram Advance publication.