Sadly, this isn't something you can buy. It's a garage kit, which means it's basically a home-made piece, so the astonishing detail you're seeing here is a one-of-a-kind. As something so beautiful deserves to be.
It's Ultima, a summon from Final Fantasy XII, and the impressive statue stands an enormous 20" tall.
I've included some impressive images of the completed piece, but you can see more—including in-progress shots—at the link below.