A new place I found that looks interistin is
http://www.karaoke-version.com/karaoke/. Many of the songs are available in cdg, wmv with balck background and wmv with a multicolored background. Demo's look good, nice little selection of newer songs and only about $3 US. and several different languages available. And they look legit.
I have yet to try them but I've got'em bookmarked for a future purchase.