Have you called the store connected to this site?
This is probably your first and best choice when looking for a port port. (Just had to say that).
OR, if you've got the skills, remove the old one in one piece, take it to a plastic shop, and have a copy made.
OR, if you've got a hobby woodworking shop, do the work yourself and cut your costs to a mere pittance. This is the key tool to the whole crazy stunt :
I've done three hatches so far and they're quite easy once you get the hang of it.