I just picked a Tucano Navigo Universal 7" Tablet case at Best Buy for the Aura, it fits with room to spare.
Just needed some protection for taking the reader out of the home, I prefer to hold the Aura directly as I quite like the back of it so I was looking for a sleeve at first and found this case instead. It was $29 CAD.
Here's a video about it:
http://youtu.be/BB7nbm9VJ4E
Hope it helps!
Best
Katy