Here's a great tip for all you television broadcasting majors and minors. Professional studios many times have permanent painted or built in green screens. However, as a student you might not have access to that. This can be a real problem, especially if you have a video project that requires work with a green screen.
To rectify this problem, go to your nearest office supply store or hobby store and buy some green poster boards and clear tape. The number of boards you will need will depend on the size of the area you want to cover. Tape the boards together, and your green screen is complete. After this, pin it or tape it to a wall to utilize it as your background.
By doing this, you will have a cheap as well as portable green screen at your disposal. Happy filming!