Where can I find clear rubber or vinyl matting for a doggy door opening, should be about 1/16'; or 1/8'; thick

I would get the whole doggy door. Petsmart is a good place but don't just get the rubber. The complete door will have the frame, a door with a magnet so it stops in the closed position, a frame to close the ';jagged'; hole you cut, etc etc.Where can I find clear rubber or vinyl matting for a doggy door opening, should be about 1/16'; or 1/8'; thick
petsmart