Below is a link to the parts lookup page. I didn't check to see if it's still available.
If NOT, I'd repair it.
Looks like the steel cable "core" may be crimped into a rod at the throttle lever end?
Any lawnmower shop would have the steel cable core if you are able to reattach it to the rod, mite take drilling it out in the lathe, inserting a new cable, them crimping it down on the cable.
Shouldn't be impossible to do!