The printed version of the handbook is available for purchase at https://www.createspace.com/4039211
If you belong to the COST action, use the discount code 4V6CXNY4, and you will get the handbook for less than 20 USD plus postage. Normal price is 26 USD or 22 EUR.
The handbook is also available through Amazon (USA, UK, DE, ES, FR, IT). However, the discount code is valid only for direct purchases through CreateSpace at the link above.
The open-access pdf file of the handbook will be soon available for download from the online repository of the University of Helsinki.