You can try AVSForums.com They also have an online sales department.
The main problem is that active 3D projectors require as much brightness as possible
Have a look at the Dalite HP screen. If you can fit your projector in the right area (i.e. zero offset pointing directly at the centre of the screen), it should give you around 2.4 gain.
The downside is that higher gain screens tend to have a smaller viewing cone, so the gain tapers off when you are off axis.
Which projector are you using?
The main problem is that active 3D projectors require as much brightness as possible
Have a look at the Dalite HP screen. If you can fit your projector in the right area (i.e. zero offset pointing directly at the centre of the screen), it should give you around 2.4 gain.
The downside is that higher gain screens tend to have a smaller viewing cone, so the gain tapers off when you are off axis.
Which projector are you using?