I got this note today — I offer it here for all those wondering what’s up with availability on Amazon. I’ve answered this question a number of times already, but this offers a little more information:

Just to follow up on the issue with Unseen Realm being unavailable for pre-order on Amazon. I found out that they originally had it marked as an already-live product that shipped in March 2015 (see metadata) not as a pre-order with a future ship date. We are inquiring to fix it; it’s probably in the middle of being fixed.

I wasn’t kidding in earlier posts and comments about robots and metadata. That’s just the way things are nowadays, especially at Amazon. And you always need a human to fix things when there’s a mistake in the process. They’ll get it resolved.