At the bottom of this page:
http://forums.kc-mm.com/Gallery/Resources.phpThough, it seems that the PAL repository is down. The Google Drive NTSC repository works fine, though.
If you're looking for PAL, the easiest place to get it would be your own Brawl CD using either CleanRip to get an ISO or a USB Loader to get a WBFS. (You'd have to run the WBFS through Wii Game Manager to get an ISO, but that's not really hard to do at all. It's just a waiting game.)