If you are interested in buying Twenty Years of a New Kind of Science separately, it is now available for purchase on Amazon:
Order it here:
https://www.amazon.com/Twenty-Years-New-Kind-Science/dp/1579550495
If you are interested in the limited edition boxed set,
Get your copy here:
https://www.amazon.com/Kind-Science-Anniversary-Limited-Boxed/dp/1579550568
