Are you looking to download the software, or to obtain the actual floppies? System 6.0.8 is a free download from Apple, but you need an older Mac to be able to create floppies from the downloaded files.

To download, go to massively long URL here:

http://download.info.apple.com/Apple_Support_Area/Apple_Software_Updates/English-North_American/Macintosh/System/Older_System/System_6.0.x/