Amazon has the Karaoke USA Portable System (Black, GF839) for $56 with free shipping. Features 35W peak digital power amplifier (25W RMS), record voice and music mix and instant playback, 300 MP3G songs.
Has good Amazon Reviews.
eBay has the Alesis Burst Electronic Drum Burst Set (Black) for
$225 with free shipping. List price: $300. Features 10 ready-to-play drum kits with drum and cymbal sounds, a throne, 40 play-along tracks.