How Amazon lists a title and the available/in stock status on their website is ultimately up to them. Amazon's purchasing decisions are supported by an algorithm that is proprietary to Amazon. In choosing to stock titles or even show products as available on their sites, Amazon considers many pieces of information about your book. Factors in a decision to stock a book may include discount (with a maximum wholesale discount of 55% being most favorable), whether a book is returnable, product page views, and sales history. Even print on demand books may not show an 'in stock' message at Amazon. Amazon may also list your title as available through third-party vendors.
For additional information about Amazon's title status messaging, please visit the Amazon website.
Requirements for Amazon.com
*We are only able to notify Amazon.com, Amazon.ca, and Amazon.co.uk once a title has been in distribution for at least 30 days. We then allow Amazon’s website enough time to update once a title’s metadata is sent before our initial notification.