For my Kindle Keyboard ereader I have the Amazon lighted leather case and one silicone skin. I keep it in the skin at home, and put it in the protective leather case when I go out.
I have two Acer Iconia tablets, a 7" and a 10". I have a leather cover for each and a TPU case for the larger one. I'd like to get an Acer bumper case for the 7" tablet, but it's too costly.