You can sell any print book enabled for distribution with Ingram Book Company that is in stock or on order. Aerio will capture both pre-orders and back-orders of print titles.
The best way to search for a print book is by ISBN. Here's more information about adding print titles to your Aerio inventory.
If you are still having trouble locating a print book, email email@example.com with the ISBN of the title you are looking for.
If you are trying to add an ebook to your Aerio inventory, see: How to Upload Your eBook & Create a Preview