Recently, I decided to try out a new type of chroma-key green screen- poster board. Coming in many colors and sizes, poster board seemed to be an excellent option. At Hobby Lobby, I found the perfect poster board. At only 89 cents per 22x28 inch board, this 12 point coated poster board is excellent for chroma-key. 

The results are much improved over those with my previous green screen. The picture quality is much crisper, and I no longer have the problem of  being transparent! I would recommend poster board as an inexpensive and effective type of green screen material

☼ JB