Lightning Source publishers interested in using Ingram's Guaranteed Availability Program should contact a Lightning Source sales representative to inquire if they qualify.
How it works:
Ingram Book Company (IBC) supplies books to bookstores, libraries, retailers, schools, etc. Each of these Ingram customers are assigned a primary and secondary distribution center (DC) for fulfilling their orders. When an order is placed for a book, the IBC system first checks the primary DC. If the book is not there, the system checks the secondary DC. (TN is usually assigned as the secondary DC)
If the book is out of stock and the publisher has the book set up in GAP, the book is printed by Lightning Source and the order is fulfilled by Ingram.
When Ingram receives additional stock from the publisher, the print on demand printing of that book will stop.
This allows a publisher's book to never go out of stock so they never miss a sale.
This link will take you to the following GAP information on Ingram's website: