Based on a comment on similar lines in anotehr thread, I ended up buying a case intended for Kindle (I already had one, but it had those elastic straps on the four corners, and whilst the case itself was solid enough, the fit was tight and i just didnt take to it). The case I'm sticking with (literally as it happens) has an adhesive on its inside back cover, so you stick your device to it and it will not move. its leather, with a magnetic lock. I dont mind that its not a sleep cover, I have one of those on my ipad and i dont like it, it only has to slip a bit in my bag and suddenly the ipad lights up and drains battery pretty fast.
Here it is and they also have
a tan coloured one. I chose black.