I just got this case for my 650 from Tuff-Luv:
Tuff-Luv Napa Leather Case
It is the first case I have gotten that is made for my Reader. I have been using homebrew cases since I got my 505. None of the cases seemed sturdy enough to protect it, other than the M-Edge Platform Jacket I got for my wife's 505 and later for her 950. My wife bought me this one for my birthday this year and it is quite nice. I am concerned that the front cover isn't rigid enough to protect my screen though. I was tempted to slit the stitching on the front cover and slide in a piece of plexi as reinforcement but it will not work for two reasons. One, there is not enough room in the front cover for the plexi and two, I would never get it sewn back up while keeping the strap at the bottom.
I guess I will just have to be careful as to how I put it in my bag.