Best place for Apple OS9 Installation media?

I've been googling, but can't seem to get anywhere.

I'm looking for Installation CD (Or a legitimate ISO) for OS9 for an Old apple imac G3. They already have OS9 installed, but I want a fresh install.

Wondering if anyone has a source?

I actually have 5 of these machines and going to see if I can install Linux on 1 machine (maybe to sell) and turn 1 into a PC with a new flat screen (maybe to sell).

I found somewhere to download an ISO that isn't a torrent.