The book doesn't appear to be exclusive.
Kobo carries the ebook just fine:
http://www.kobobooks.com/ebook/My-Mo...-HaLwrfPbQ&r=1
The pbook is list priced at US$26, the ebook is List Priced at US$14, and on sale for $9.99 at Amazon. I see it for $10.09 on Kobo.
B&N still swears they're *not* carrying Amazon books.
And good old Publisher's Weekly thinks it might be a glitch.
http://mhpbooks.com/no-means-yes-bar...-marshall-bio/
They might have an inventory control issue:
http://www.barnesandnoble.com/w/my-m...=9780547892627
Maybe they'll try to recall the books sold and refund the money?