At the Perry and York Shows I was told the link on my site for the company that sold them was broken.
I contacted the manufacture and they referred me to the Feller Co.
Call Fellers @ 1-800-654-8405
Ask for the Plast-Kut Knife on Page 138 of the 2008 Spring Catalog.
Mine cost $22.39 ea. + tax
You can only buy the knife by calling the 1-800 numbers and paying by card.
Have it shipped or pick-up at the nearest Fellers location.
Cities for Fellers pick-up locations.
http://www.fellers.com/index.cfm/spKey/company.htm?spId=8A246D8A-BCAD-7864-0D6B3AF900A70E37