Welcome to the Forums.
About your only option is to buy a used door from a trailer that is being parted out (ebay, airforums classifieds, Airstream Addicts FB group, etc). Some of the commercial sites will occasionally sell used parts (Vintage Trailer Supply, outofdoorsmart.com, etc.).
But the next question is, what is wrong with the door you have? Is it missing, or just damaged? Lots of folks have completely rebuilt doors with good success, but you have to have the frame to start with.
good luck!
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