Available at the Polity site, but Amazon UK has it for the discounted price of £11.99. Amazon.com doesn’t have it yet as the US release date is a little later. Google Books has quite a bit as a preview.

If you consider that Spheres I: Bubbles is now available; and that another collection of essays was released just a few days ago – In Medias Res: Peter Sloterdijk’s Spherological Poetics of Being, this is an important moment in the English-language engagement with his work.