Hi Big Jo! Welcome to the MobileRead forums! Regarding your search for a good cover... Many of us have made our own using various non-book items such as Leather notebook covers from a stationary store, small Neoprene rubber laptop covers, DayKeeper binders, etc. A lot depends upon how you want your cover to function.
I use two rubber computer 'notebook' covers, one made of neoprene and the other made of sorbothane, one inside the other. I like my cover to be a 'slipcase' so I glued up the side zippers and cut off the top one. Now my e-reader can slide into the case without having to remove the case from my shoulder bag. In another thread, someone used a DataKeeper folder so as to keep the reader inside the case while reading. The choices are endless (and cheap!) if you use a little imagination!