I added this on another thread, but it applies to your question as well.
You can make an inexpensive portable screen from a sheet of Formica. Use Fashion Grey or Designer White. Not plain white. The two listed have been tested, along with just about every other brand of home counter covering, and these had the best results. There are folks on some DIY home theater forums that I belong to that are heavy into this.
Anyway, for about $65 and about $20 for the support pieces, you can make a quality screen and use it where ever you want. I have one in my dedicated theater room I built out of Designer White Formica.