We bought one a little over a year ago.  It came from a guy in Iowa that bought out the New Idea parts inventory...at least that part of it.  Was around $1000 give or take.  Pretty sure it was purchased thru local dealer so unfortunately I don't have the name/address.

FWIW, best $1000 a guy can spend on spreader parts.  Never had an upper beater before.  It's awesome.

I'll see if I can find out more...