For the entertainers that include MP3 or CD&G files in their show, I have found a site for downloading at .99 each, including the embedded lyrics.
http://www.buykaraokedownloads.com/index.php?mode=artist&gid=3

I have a software player
http://www.powerkaraoke.com/src/prod_karaokecdgcreatorpro.php

This is an economical way to build a library for your laptop. To go a step further, I just found an interesting piece of software for your Ipod type device, that loads the lyrics along with the MP3, and displays them.
http://www.powerkaraoke.com/src/prod_cdg_ipod_converter.php

Bernie