Gotta laugh

"Private message, please don't post on the listing. Hello, Would you accept $850 for your Spiderman machine? I would be happy to finalise a deal outside of this forum and pay by bank deposit to save you some $$$ in seller fees."

and using the sympathy angle too.

"it would be for my son's birthday which is in a couple of weeks. He is a huge Spidey fan and would go nuts over something like this."