Has anybody made their own green screen?

I’ve heard from several people that there is no reason to save up for a super pricey green screen if you’re on a budget. Obviously those products will be less wrinkled, more responsive to lighting, more uniform color… but I just don’t have hundreds of dollars these days :P

Has anyone made their own green screen before? What kind of fabric did you use, and where did you get it? Good experience so far?