Do you mind my asking why you're just looking to replace the drive when I'd surmise labor costs might make that as expensive of an option as getting a new player? Or are you doing it yourself?
Looks like the DMP-BDT310--the dual HDMI player from 2011--is about $210 on Amazon.
And surprisingly/excitingly enough, I've just learned of a new flagship deck from Panasonic rolling out now, the DMP-BDT500. It not only restores the dual HDMI outs that they dropped from the x20 series but it also brings back 7.1 analog multichannel outs (not seen on a Panny deck since the BDT300 and BDT350 from 2010).