One of the things that I'm required to do is to protect it when I sleep. One of the ways to do this was to cover it or sleep with a silk pillowcase. That is so much easier to me then putting anything on my head at night.
Summary: I got my case from Walmart and it's not bad. The color is the only thing that bothers me. It matches nothing in my rooms decor. No noticeable differences in my hair yet. It's $7.95 and [depending on your location] comes in variety of colors.