For what it is worth, I just built a Polariscope. An old friend, Joe Hansen,
had built one about 15 years ago. With the instructions was a phone number.
It was from Edmund Scientific. I purchased a sheet of film from them for my
scope. The sheet was 8.5" by 19.5". The cost was $20.40 plus shipping and
taxes with a total cost of $29.58. It works. Their phone number is
856/573-6250.
Pat Henderson