sdw lol

Where the heck do I get this book? I was watch the american Office an it's the episode where they talk about it. I wondered "Is that a real website?", I assumed that it was because Rainn Wilson made a real website being in character as Dwight. So I looked it up and I found out it's not a real website but it's a book. So I wondered as any office fan would I looked where I can read it. It's not on Amazon, Google Books, Books-A-Million, Audible, Play Books, and my local Library. So I scroll and I see it came out February 7, 2018. I look at the reviews and it's all from the recent weeks and months. What I'm confused is How do I get this book? How did the people who read it get that opportunity?