Here is one that can be hidden when not in use. It also is of a different thin cellophane film material and is close to having no wrinkles or waves. I have rolled this up and down hundreds of time without any issues.

http://www.spacelofts.com/h30/mini-IMG_2391.htm
click on the NEXT 4.
Click on thumbnail and look at the link on Top for the DaLite portable screen.

http://www.quadloft.com/hometheater- new HT