locating plastic and ripstop

[Dragonsbain]

I was wondering if anyone might know where to obtain colored plastic film on rolls. I have just built my first parafoil and now want to build many others for myself, but am unable to locate the plastic that we used in the demonstration. I would like to have many different colors with a thickness of about 1.5mil. I am also looking for a good place to get clear and colored mylar. If anyone can help it would be appreciated.