In addition to our own store at Kunaki.com, the DVD sets for seasons 1 and 2 are now available on Amazon.com! See below for more info:

Volume 1: https://www.amazon.com/Day-Zero-Season-2-1/dp/B01LTI1M0I/

Volume 2: 
https://www.amazon.com/Day-Zero-Season-2/dp/B01LTI1M1M/