Picked up this case from Amazon since I didn't like the colors on the official case.
I had to buy a pen loop for a stylus, but aside from that, this is a basic no-frills magnetic case that I don't have much to complain about. The magnets hold the device secure enough that I don't feel worried about carrying it around.
If you search that case on Amazon you'll see it comes in other colors too. For ~$26 it's not a bad deal.
Some more pics:
