dude, those new ones were sold at 291 USD (official bitmain price) and now you ask even more for the used ones? I could understand this kind of logic if you were selling them on ebay, but it's btctalk, where people mostly know what they buy and how much it really costs. If delivery wasn't a problem I would give this unit ~250 USD as a fair market price.
Since when are miners ever "fairly" priced? Either used or new.