Hey Thecshare
Well I've seen these on ebay in the average going for 800-900 USD in average. But sometimes also for around 550-600 USD when the seller probably need to sell it fast.
I am not sure how much it goes for here, as the last auction from anonymousminer I've seen was without bids, but if I am correct, the starting bid was also in the range 500-750 USD, something like that...
Sorry for not being more specific, have to run to the meeting
Good luck with your sale!