Hello!
My Japanese class and I are planning on entering our college's talent competition and our sensei has selected
Ashita ga arusa by Ulfuls as our song to sing!
It'll be crazy fun, but we can't find an instrumental or fan-made version anywhere to use.
Can anyone tell me where I can find an instrumental/karaoke version of this song? It would be amazingly useful to me

Either download links or purchasing is fine, I'll be buying the song when I can anyway.
Thank you!