8/30/18 Edit: We are seeing purchases of $495 now.
Quick Greentoe overview below the item description.
YMMV as this is for Greentoe and depends on what the merchants choose to do:
I put in an offer of $500 on this brand new receiver(on 7/23) and it was accepted a few hours later. I also provided payment information(paypal) as Greentoe stated it may increase your odds of a bid being approved. You may have even better results than I.
MSRP is $999 with current prices about $599 for this soon to be discontinued model. Last deal I saw was for $599 w/ $50 GC from newegg.
For those who don't know how to use Greentoe. Firstly I don't work for Greentoe or any such thing. To use this site you sign up and provide a price offering of your choosing for a brand new item(so full warranty and from an authorized dealer), which is your final price to pay, no additional tax / shipping / fees. The merchants can choose to accept or counter your offer or ignore it.