I need a price check on a gtx680 lightning from MSI

As is in the title. Got one from my RMAed 580. selling it. would like to get an honest price to post it to ebay. Cant seem to find one that makes sense on ebay, and none of the major sellers  have them in stock anymore so i can't get a price. It's one of these http://www.newegg.com/Product/Product.aspx?Item=N82E16814127693.

all the ebay prices seem really high I would say $275 or so as you can get a reference 770 for $300.  I might be interested in your 680 depending on what price you decide 

What kind of OC can you get out of it, and at what voltage(s)?

i dont know about the OCing. Didn't put it in my rig. I'm momentarily leaving the master race. So my rig is in boxes now. It is manufacturer refubished. I posted to ebay for 375 buy out. and got 90 bids in 2 days. it seemed a bit off to me.