Spallinger Combine at Bluffton, Ohio.

http://www.spallingercombine.com/

It's a combine salvage yard they probably have used ones and also new ones and are also dealers for TSR choppers you can also get the fine cut TSR rotors, updated fins, heavier bottom sheet and the updated knife bars.

http://www.tsrparts.com/straw-choppers-complete-units-for-john-deere-combines.html