Gather a finished copy of your book, not a manuscript, marketing and promotion plans, and any trade reviews of your book.
Write a letter describing what makes your book unique. Include your phone number and email address. Make sure the materials include the book's International Standard Book Number (ISBN) and suggested retail price. This letter is very important and should be professionally executed and clearly written.
Put everything in an envelope and affix postage. Mail to The Small Press Department, Barnes & Noble, 122 Fifth Avenue, New York, NY, USA 10011. Barnes and Noble will reply to all submissions with a written answer in about six weeks.
Fill out Barnes and Noble certification paperwork relating to the Consumer Product Safety Improvement Act of 2008 (CPSIA). You can find more details and a sample letter in the resources below.