Price for a used one? Wow... I would think finding someone selling their 2016 B6 65" at this point in time would only be because it has panel defect flaws they can't live with and are past their return period. That said, if your search Amazon for OLED65B6P you'll find several places selling used, refurbished etc with prices all over the place. MSRP on these was originally
close to $7K.
If you are talking about buying "New" from a local brick and mortar store I wouldn't pay more than $2999. I've seen it at low as $2799 around Black Friday last November but the $2999 sale price seems to be a more frequent occurrence during holiday sales etc. However... with the last big "month long" $2999 sale all the retailers were running leading up to SuperBowl and with the 2017 models already rolling out... its getting harder and harder to find stock on the 2016 models. As quantities continue dwindle sales & price cuts seem less likely but... the optimists in this forum thinks they will drop the price on these sets one more time to clear out remaining 2016 inventory. If that's the case you'll want to Google OLED65B6P for sales prices every single day so you don't miss out on the opportunity if it happens.