For the film try Edmund Scientific at:

http://scientificsonline.com/product.asp_Q_pn_E_3038396

Their   3037349 7" x 9" Gray Film Polarizer, Thickness 0.01"
   $6.95 looks like a good price.  You need 2 sheets.

Several years ago I bought plastic polarized sheets through a local photo
shop and paid much more than this.

Brian Gallagher

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