Curious about price

I have been ho-humming about downgrading a bit due to time constraints and of course I could use the money. I'm wondering what a used 285gtx 666 edition goes for right now. It's basically the fastest factory 285 you can buy and nearly impossible to find. I paid a little over 500 bux for it with 2 year IPR. It does just under 9000ppd on good days and averages over 8000ppd. I've never installed past 191.07 drivers on it either.

Like I said I'm just curious because I haven't been able to find a used price on this card yet just a metric ton of reviews.