This Wireless Karaoke Microphone, originally $29.99, drops to $17.99 when you enter the promo code 40PB3X9A during checkout at Amazon. Shipping is free, but you must select it at checkout. This is the best price we found by $6. This microphone has a built-in rechargeable battery. It also includes a voice disguiser with multiple voice options. Sales tax is charged in most states.