Trackball ball replacement

Hello i was cleaning bearrings on my kensington slimblade and i didnt noticed that ball i placed on table is slowly moving to tbe side and then fell on the ground. I know i was stupid but now it has a small dent and sometimes i run with that dent through bearring and it is kind of annoying is there a way how to fix it or do i need to order new one? If i had to order new one do you know about good shop for trackballs preferebly in europe