"Unread copy in perfect condition." and it is $39.56 instead of $29.99.
My guess is this is just a drop shipper. This seller doesn't actually have a copy of the book and will instead automatically order it for you if you choose to buy from them.
I don't understand why such a drop shipper would get any orders when pricing considerably above new. Do you have any insight as to why somebody would bother? Seems like a wasted effort.
Sophistifunk's mention about it being a bot is most likely the case. Frequently drop shippers will source (site scrape) from one website and sell on another.
A good example would be purchasing (used) books from AbeBooks.com, and cross-posting to the Amazon.com marketplace for sale with a markup. Sometimes their prices may come out lower and actually result in a sale.
Chances are this bot scraped this book from another site (among many others) and re-posted it to Amazon with this markup.
Side anecdote: Ever seen posters around town claiming you can "make $X / month, working from home!" ? Sometimes these are drop shippers. They cannot always ship orders directly to the customers that purchased them due to whatever security restrictions may be in place from where they are actually purchasing their merchandise from. Instead they hire folks to receive packages, slap a new shipping label on them, and send them back out.
My guess is this is just a drop shipper. This seller doesn't actually have a copy of the book and will instead automatically order it for you if you choose to buy from them.