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 Microphone Scissor Arm Suspension Boom for $9.99 with free shipping. Retail price: $30. Features adjustable legs for placement on uneven surfaces, compact microphone stand designed for heavy duty carry.