Karaoke Forums

I was wondering if anyone knew of a website or something where a person can buy (download legally) karaoke songs. There are some songs I would like to do but don't want to put out the full $20-$30 for a CD with one song that I need. I would also like this to be an acceptable file for a KJ so I can give it to them and have it added in their list of songs.

Also, I never really tried it, but are there any programs to take the vocals out of songs so you can create your OWN karaoke songs? How well does that work? Again, this would end up wanting to be given to a KJ so it would have to be good.