Slip Rockler has a duplicator for large lathes $199.00 They have a Cambridge MA store, and a website I saw it in their catologue.
http://www.rockler.com/ecom7/findpr...&DID=6&sku=6579
don't know if you saw this already. It was posted in the swap post. Don't know why the link isn't working in this post. It works in the other post. Part # 27130