Back in September, I bought one of these bad boys:
www.newegg.com/Product/Product.aspx?Item=N82E16814150551
I paid about $150 for it and the lowest 6850 I see on Newegg at the moment is $140. I don't need it anymore since I won a 560 at the LAN
It works great, but I will point out that I've had some trouble with the fan; when starting up, on occasion, it gets loud as hell. After a little while, it'll calm down, though. I did an RMA on the original fan 'cause it rattled, but the new one just has that noise issue. I've had no issues with temps and haven't overclocked it at all. From what I hear, you can easily overclock it to get 6870 performance.
I'm looking for $120 starting out OBO, which includes shipping (I'll knock it down to $110 for pickup). This includes the card and original box (I did do the mail-in rebate they had at the time, so no UPC). If you want the original fan/heatsink as well, you can have it if you'd like, though shipping is separate.
Alternatively, I'm looking for a decent AM3 proc. Right now, I have a Phenom II 555 and would like to upgrade.