For sale is a brand new audio monitor, Sony model NTM 910
http://www.amazon.com/Sony-NTM-910-BabyCall-Sound-Sensor-Nursery/dp/B00191MP3Y
Asking $20 + Shipping for HB Bee levels Olive & above.
$25 + shipping for all others.
(I'll combine shipping if you buy any of my other items)