Cast in Silence doesn't exist as a new book yet. It doesn't exist as an ARC yet. It barely exists as a finished manuscript, because I am still working my way through the AAs mentioned a couple of days ago.
The "merchant" in question is asking how much? Guess. The answer is here.
I'm not entirely sure what he -- or to be fair, she or they -- hope to gain from this, and mine is not the only "used" book offered for sale at this price. The other one thirty seconds of perusal turned up is Maria Snyder's also as yet unpublished book. I cannot imagine that anyone--besides a publisher--would pay 1,000.00 for a book of mine, let alone one that doesn't even exist.
So. Just in case you're curious: He isn't selling an ARC. Because it doesn't exist. He isn't, as far as I can tell, selling anything genuine. If anyone asks you about this, please pass it on, or point them here.