Take the 2-minute tour ×  I'm a writer, working on a non-fiction
book proposal. Finding public, free sales numbers for comparable
titles is nearly impossible. BookScan is a subscriber service
run by Nielsen. "Above the Treeline" is a subscriber service
that collects sales data from some independent book sellers. But
I'm looking for reliable services that I could tap into.  Any
suggestions?  share|improve this question  3 Answers 3  Ingram
is the largest book distributor in the business. You can call
their automated stock check number at (800) 937-0995. Enter a
book's ISBN, and you'll get back its current sales data.  You
can also get Amazon's historical data by signing up for an
account at TitleZ and selecting the books you want to track.
Both of the above are free services.  share|improve this answer
In my experience, you're not likely to find much of anything
useful without paying. The Association of American Publishers
has some statistics for free (2009 Preliminary Estimates), but
you'll have to buy the