A $100 on eBay most likely, but really they're $60 CIB. Thats what I paid for mine a few months ago.
Play-Asia has good price, but I'm too wondering if its complete or loose. It doesn't even say anything about its condition either or give a picture of the actual item. Still, for the desperate its cheaper than ebay.
Whoever buys it is gonna have one hell of a time trying to pass the first stage. I've only managed to reach the 3rd stage once. Setting the difficulty to easy doesn't relieve the pressure, still too hard.