Finding a case was a challenge for me as well. I didn't want a bulky case as it'd take away the sleekness of the phone but definitely wanted something sturdy enough to protect it. And I really didn't want to cough up $70 for the Samsung one I wanted. I ended up buying one of those clear cases on Amazon and wasn't feeling it. The bottom half also kept slipping when I grabbed it from my pocket.
I ended up taking a chance on a Mosike slim case on Amazon and I LOVE it. I got the fiber black and it is great. It feels solid, isn't bulky, and it looks clean. The problem with lots of these cases on Amazon is they're not in stock just yet so you might have to wait a little, but I really like mine.
It doesn't have 5 star reviews but really the only 2 negative reviews are one that came damaged (annoying but can happen to any product during shipping really) and the other is because the person isn't happy with the color. Lol I feel like a sponsor but I know the pain of looking for cases for this phone so just trying to help a fellow Z user.