Just purchased two covers for the wife's and my PRS-650's from ebay the end of last week after an exhaustive web/local store search. The wife's cover just arrived yesterday, and the reader fits perfectly. The flap that covers the screen is stiff, which was a requirement for us as we want to protect the screen from breakage --well minimize the chance anyway. Best of all, didn't have to pay ~$45-$50, only about $16 including shipping.
The seller seems to have a good supply of these, and just started selling them. Have a look.
This is to a current open auction for the same ones I purchased for reference:
http://cgi.ebay.com/Black-Leather-Co...item3cb4f9cdc8
Here's the ebay search I used for PRS-650 case covers:
http://shop.ebay.com/?_from=R40&_trk...All-Categories
Although my wife has only had it since last evening, she really likes it. Still waiting for mine to arrive.
BTW, I have NO association to the seller what-so-ever other than I purchased two of these cases from him/her.
Tim