Unfortunately the book's official website https://cpbook.net/ is currently returning the following message:

> I (Steven) is currently experiencing server upgrading issue (today is 30 Nov 2016)... https://cpbook.net will be revived soon when I am done with Semester 1 teaching in NUS next week.

The good news is, using the Wayback Machine, I was able to extract the link for purchasing the hardcover book:

https://www.lulu.com/commerce/index.php?fBuyContent=13872302

Pro tip: Use the coupon code FWD15 for an additional 15% off making the hardcover cheaper than the Amazon paperback price.