Screen Door Panel Insert

[MooseSuite]

The plastic film on the bottom insert has separated from the spline on one end.
Reading how to fix, it seems cutting a lexan insert is the most economical, over replacing with a new panel. Ie I haven't found how to replace the film.

Anyone found the film and process to replace. I really don't want to order new, probably expensive. Know of the vendor to contact to find a price.