Clear half-masks are how-made/where-bought; Anyone Know?

Does anyone know how to make resilient clear half-mask molds and where the supplies might be purloined in bulk? Alternatively where translucent (non-opaque) Venetian blanks may be bought? eBay's Useless.Clear half-masks are how-made/where-bought; Anyone Know?
The only place I've ever seen unpainted translucent masks for sale is at http://www.unitedmaskandparty.com/Masks/basic.htm -- they are full masks but you could cut them down to any shape you want to (scroll all the way to the bottom of the page). Alternately you can make a cast of your face and then make a mask out of mask latex which can be purchased in a (sort of) transluscent-amberish color.