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From Amazon:
We appreciate your interest in adding titles to the Amazon.com Book store.

Amazon.com now offers complete publishing, printing and distribution services for writers through its affiliate, BookSurge. For complete information, please visit our BookSurge page.

Titles currently available may be listed on our site via one of the following methods:

1. Through Amazon.com Advantage Amazon.com Advantage is a proven and powerful means of listing, distribution and order fulfillment. Work directly with the Internet's leading retailer to market your books to customers. And for specialized technical, professional and medical books with a minimum retail price of $75, there's Amazon.com Advantage Professional.

2. Through our Pro-Merchant ProgramBooksellers who sell and ship used, collectible, and remainder books may list their inventory through Amazon Marketplace. We offer volume-listing tools, frequent-seller programs, subscription selling rates, downloadable inventory information, and more.

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http://www.amazon.com/gp/help/customer/display.html?nodeId=13685731
BookSurge - Publishing and Print on Demand

On-Demand Solutions for Independent Publishing-

BookSurge, an Amazon.com company, offers complete publishing, fulfillment and online distribution services for independent publishers. Whether your book manuscript is finished and in ready-to-print PDF files or a working draft requiring editing, illustration, or formatting services, we've got the services you need to create a professional trade paperback or hardcover book and the tools to distribute your books cost effectively.

Sources: http://www.amazon.com/gp/help/customer/display.html/104-7227968-9547934?ie=UTF8&nodeId=14061771