Which means ... amazon.com is selling my book used. Okay, for a company with fingers in so many pies, that makes sense. But my thought was "the book only came out in August, who would sell it to a used bookstore already?" So I was interested to examine it. It does look like it's been read a few times, the cover's dinged and such.
My suspicion is this ... the book gets leafed through a lot in bookstores (I watched some guy at a Barns and Noble go through the whole thing, page by page, at least twice (he didn't buy it)), some of these copies get a little bent and mangled and, possibly sent back. My publisher re-sells these, in bulk with other titles of theirs suffering the same fate as "used" to places like amazon who then re-sell them. So while it may not technically be "used" it's probably been read 100 times. Sort of like pre-remaindering.
Or so I suspect anyway.
Here's Bash and Cisco.