Amazon has the sets for sale again as of 6/1. Walker and both sparrow sets.
https://www.amazon.com/Mega-Bloks-Destiny-Sparrow-Building/dp/B01B7OZIBI/ref=sr_1_1?ie=UTF8&qid=1464799839&sr=8-1&keywords=destiny+mega
https://www.amazon.com/Mega-Bloks-Destiny-Sparrow-Building/dp/B01B7OZI36/ref=sr_1_2?ie=UTF8&qid=1464799853&sr=8-2&keywords=destiny+mega
https://www.amazon.com/Mega-Bloks-Destiny-Fallen-Walker/dp/B01ARGB8GG/ref=sr_1_11?ie=UTF8&qid=1464799853&sr=8-11&keywords=destiny+mega