Browse the aisles of your local Toys "R" Us or other toy, hobby or game shop. Many kids' stores stock karaoke CDs, machines and microphones. While you're at the mall, check out the music section of Target, Wal-mart or Best Buy for karaoke CDs.
Buy kids' music CDs from Amazon.com, CDUniverse or other online music retailers. Use the site's search functions to locate CDs from your children's favorite movies or TV shows.
Download karaoke music from iTunes, Napster or Yahoo Music. Since kids can be impatient when they hear a song they like and want it right away, this method will save you a lot of time and stress running from store to store.
Consult a party store. They often have kids' karaoke music and machines for sale or rental.
Get out the plastic and click through sites like Ace Karaoke.com and Pocketsongs.com. For lesser-known or out-of-print kids' karaoke, check out eBay and Half.com.
Look for kids' karaoke CDs in your school or local library branch. Libraries often carry older CDs, particularly recordings focused on holiday and educational themes.