This Polyvinyl Alcohol-Iodine filter has no color distortion (neutral) and very good polarization efficiency (99.9%). The losses are low (38% transmission for unpolarized incident light).

It comes in a width of 17" (43cm) and you can order any length in multiples of 1 foot (30.5cm) (full roll is 800 ft long = 244 meters).  The transmission axis is parallel to the width. It is 0.006 inch (0.15 mm) thick.

Just $15 per linear foot, that's only 7 cents/square inch  (1 cent/cm²).

Easy to cut with scissors to any shape.

Transmittance single: 38% +/- 1% @ 550 nm
Transmittance crossed: < 0.005 @ 430 - 670 nm
Polarizing efficiency: > 99.9 %
Haze: 1%

Sold by length in multiples of 1 ft (30.5 cm).
For example, an order of 3 corresponds to 17 inches by 3 ft (43cm x 91.5cm).
Minimum Order: Just 2 feet!