Amazon has the Memorex SingStand 2 Home Karaoke System for $17 with free shipping on $35+. Retail price: $80. Features dual microphone jacks, enhanced voice controls, amplified speaker at the base.
Has good Amazon Reviews.
eBay has the Open-Box Sony WiFi Blu-ray Disc Player. (BDP-BX370) for $42 with free shipping. List price: $100. Include 1080p video playback, built-in WiFi, built-in streaming apps (Netflix, Hulu Plus, Pandora, etc.), HDMI, and USB.