They're in the Resources section of kc-mm. Here's a direct link to Wario's folder from a few clicks:
Click Here.*Remember, you can click "Add to Drive" at the top-right of the screen, and then download the entire folder by accessing Google Drive, instead of clicking each individual one.*
Post Merge: May 29, 2015, 11:14:53 AM
*Ignore the below comment if you're an NTSC user, instead of PAL.*If you're asking for PAL Wario files, though, I don't think they've restored the PAL link yet...
You can still manually get 'em if you have the PAL iso, though, and I can tell you how to make one if you don't have one.