Looking at the link, I decided to order one. Not for protection really but for a nice look, and since I really don't like the cases that are bought. This is prefect since I still have the feel of the reader.
I bought the one called
BookShelf, seemed proper for a ereader.
I also had something like 15$ in my paypal account that was doing nothing for at least 6 month. So all in all (with a coupon I found) it cost me 3$ + shipping. Not bad really.