Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
I have had my Marware EcoVue for a while on my 5th generation nano. It's been a great case and has saved my nano from many drops.
 
Just ordered this today for my new (refurb) Nano 5G for around $10. Was about $20 a few weeks ago. Seen good reviews on it.
 
As an Amazon Associate, MacRumors earns a commission from qualifying purchases made through links in this post.
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.