If you’re seeing this page, it’s because the book you were trying to get to is still being processed by the ebook stores. I try to get a pre-order for the next book up on at least Amazon before the current book comes out, but sometimes they can be slow about listing it. I would suggest trying the link again in a few hours, or seeing for yourself if it’s listed on Amazon. If it goes live while I’m at my day job, I won’t be able to update this link until I’m home.
Apologies for the inconvenience!