Talk to a local QUALITY printer, not some instant press outfit. Ask who their supplier is, tell them why. They will either tell you where they get it from, or they will have an old under a bench somewhere that they will give/sell/loan to you. Or while you are looking in the Yellow pages, look for "Printers Supplies and Equipment."
Example of what kind of printer to look for: Years ago I did some graphic work for a company called "Western Color Graphics" and they were in the Yellow pages under "Engravers" Sadly, that old German who ran it has now passed to the Big Printshop In The Sky but he probably had a half dozen of those things laying around.