I just bought one on ebay
from a dude in Canada, he has more, brand new, paid around 80 total shipped. Just check ebay canada. He shipped fast too. Great unit, has usb sound in for the computer, an aux in with headphone jack and volume control that is always on ( so one person can listen with headphones and another can listen to something different on the car stereo)
This is a fantastic unit in my opinion, I got it even though my WX-7700MDX already has an aux in.
The thing that is hard to get and expensive is the XM tuner.
WTF is Sony avertising XM ready when they have discontinued the tuner that works with the head unit????