I tried to add a new issue (Issue 3) of Castle in the Stars on 09/26 and it was rejected saying that it hadn't been released yet. I got mine through Amazon, but the moderator said it hadn't been released to comic shops. I just checked Midtown Comics and they have Issue 3 in stock with a release date of 09/25. Midtown Comics
What resource is being checked for official release, so I know not to add issues that will just be rejected?