Used mail box post. Molded plastic. Looks like it was painted brown but was originally molded green. The door works fine as well as the flag. My friend bought a new one so I am trying to get rid of this one. I guess you can clean it up and paint it again if you like.
I have 4x4 wood post I'll cut to whatever length you want. I also have the 2 wood screws to attach the wood post to the mail box.
I checked for plastic mailboxes on homedepot.com. They go from $60 up to $100, so if you are looking, this is pretty good deal at $30.