We got the book in the day before yesterday and copies are looking slim here -- partly because one was preordered and one other was immediately marked Shop Copy! This book took quite some time to get to bookshelves and I wouldn't be surprised if they don't last on the shelves.
By the way, it clearly states it is Book One of three. I can't wait to see the next two and I haven't completely finished reading Book One! My fave so far? The Coriolis. I simply adore the way the increases slowly rotate and spiral around the foot and that you can easily do opposite spiraling socks.
Happy Sock Knitting!