Whats this worth --- Playstation Vita PCH-1004 - IDU Unit (Demo Mode)

[stellarocksme]

Hi guys,
I have a PS Vita PCH-1004 IDU (Kiosk Console DEMO MODE), I am going to sell it on Ebay but have no idea what its worth. It is a genuine IDU model and has the NOT FOR SALE label on the rear, So if anyone can advise how much its worth that would be great.

Thanks all for looking and any advice given.