You can market all you want, but if your product is not available where your customers are shopping, they can't buy it. As an indie-published author, I struggled to understand why I would visit a bookstore, ask if they carry my book, and learn that I was not in the database they order from.
CreateSpace, Amazon's ebook publishing service, has assured me that by purchasing "extended distribution" my book would be available at Ingram, Baker & Taylor, and everywhere else books are ordered. However, FastPencil publisher of my first book, had made the same claim. How could I check before visiting the shop and embarrassing myself?
I found the answer in a CreateSpace discussion forum. Thanks to a post by Eric V. Van Der Hope, author and marketer, I can pass this along: a website you can check that'll indicate where your book is being listed (just enter your book title, author name or isbn into the search box): http://www.gettextbooks.com/