Book volume 2

Hello team. 
How are you? 
Sorry I bother you again. 
I'm not able to buy volume 2 of the book on the website. 
I've tried it countless times. 
I used different credit cards (Master and Visa) and I used different browsers (Chrome, Windows and Mozilla Firefox). 
The website simply does not complete the purchase. 
Because of this, I ask: would there be a possibility for me to buy via PayPal? 
I will be waiting and thank you very much.