I like the bluetrade one BUT ... I don't think the display will work proparly because the keyboard will a little bit separated from the Athena so the magnet will not recognized the keyboard is there (as it happens with the case it comes with the Athena). This is due to the smalls grips to hold the Athena.
4 weeks ago, I found this camera bag that fits to my Athena.
The brand name is TUCANO (www.tucano.it)
When I'm wearing a suit I use to carry the Athena in my jacket pocket without any kind of case.
But the rest of the time I use to carry a small backpack. For that reason, I was looking for a case which it could be complitely closed.
As I said, the one I'm using is from Tucano and is a camerga bad. There are several sizes. My one is 'Medium'.
I hope this would help anyone.
I will add some pictures so I'm sure you will have a better idea.