I am a sound creator and I used to make 'sound sets'. These are pretty much sound files which all link to the same thing. Eg, robotic, realistic or song of choice. I was wondering if these could be an official thing? If you are willing to make of official, here is what classifies as a sound set. Or at least what I made up when I created sound sets.

Cheap: Kiai + All Hit Sounds
Average: Kiai + All Hit Sounds + Grip
Expensive: All Sounds

The price can also vary on the quality of the sounds.