Hi and welcome!
I'm sure there has been discussion of sourcing replacement blades in the past.
My guess is that the specifics of the machine may well be important - even to see if you can use someone else's part...
These folk might be worth a try...
http://www.ascateringsupplies.com/spares.aspbut, its not an area of any expertise for me, that's for sure!
Folk do tend to see this part of the forum, but maybe the "Equipment" section would be best...