Reply to Traktor S4 Left Tempo Fader Broken (for now)

I have a Native Instruments Traktor S4 for sale.

Everything seems to be working except the Left Fader which is wandering on its own. I will go and buy Deoxit tomorrow and try to clean the contacts to see if that'll fix it. The controller's previous owner stuck foam pads to the bottom of the rubber pads (I'm assuming for vibration absorption?). There's some residue, nothing big. I've only tested the outputs, but I don't see why the other parts of the controller won't work.

Does not include power adapter. I can give you a USB

Because of this, I am looking for 500+shipping via USPS.