Ha, I beat you all. I spent 59 cents at Walmart and bought flourecent Green poster board. Well actually I bought 9 of them, and some green thumbtacks, and put them up on my wall. I filmed it with my 50 dollar video conference camera, and also my Canon GL-1 camera. Make sure it is evenly lit, and you don't stand to close. I used After Effects to chroma key it, but you could use Premiere, or if it is not to long, use photoshop,,,, frame by frame.(posted 8750 days ago)Other ways, keep a eye on the sky, last week I noticed the sky was almost pure blue, so I filmed some hills and trees and took it back to my lab, sure enough, I was able to make the blue sky anything I wanted. If you don't have a lot of money, than just be creative. You might have to work a little harder, but you can achieve professional results.
I just ordered a green screen 6X7 from a flim company,,,it cost 200 bucks. But this is because I need to do outside shots, and have more time working on other special effects than setting up poster board. The sun works great for a light source. But bring a something reflective to light your objects dark sides.
I might be wrong, but I am finding out that de-interlacing my DV footage works well, and saving it as a uncompressed avi before I work with my files, and I heard green screen works better for DV.
But I am learning more each day. Hope this helps, and please email me any new tips you guys find. Jeff Lampo