I just posted a new ad on Airstream Classifieds.
When I got my Airstream it had a spare door mechanism with it. Everything seems to work smoothly. These is no key, but I found you can get new cylinders from http://odmrv.com
I will ship it, it will probably fit in a flat rate shipping box.
If you are interested feel free to throw an amount out there. I know they are around $450 new with key. The replacement cylinder is around $40.
Would consider trades as well. Looking for Pex valves, fittings or tools.
You can contact us by filling in the form on the right hand column of the ad listing: