Excellent question! There's two options. First, the original book is available on DriveThruRPG as Print on Demand here: https://www.drivethrurpg.com/en/product/460236/kinks-and-cantrips We also finished the Kickstarter campaign for the sequel which has an add-on for a hardback copy of the original as well. Late backing is open and can be found here: https://www.kickstarter.com/projects/kinksandcantrips/advanced-kinks-and-cantrip...
The latter version is still in production and will be shipped when the sequel is shipped, while the DriveThru version is available now.