The only place I can think of for help would be a forum such as:
https://www.reddit.com/r/Locksmith/
A picture of the key might allow them to make recommendations.
For what it's worth my keys have a tag on them that has "A20007" which must be the unique code for duplication.
Also I during my research I saw that Segway Junkyard sells these for $14
https://www.segwayjunkyard.com/gen-2...ry=Accessories