I know how you feel. I really wanted one of these in PRR for a long time and couldn't find any. I'm sure you know that MTH is finally re-running these in the new catalog but that won't help you.
However, I did find two of them in the Santa Fe paint scheme at The Train Room in Point Pleasant Beach, NJ.
http://www.trainroomnj.com/
I didn't want to repaint one so I didn't buy them. This was about a year ago so I don't know if they are still there or not but if you will settle for Santa Fe it couldn't hurt to give them a call.