Quite a few of them went in REA last year:
http://www.robertedwardauctions.com/.../2012/223.html
http://www.robertedwardauctions.com/.../2012/216.html
http://www.robertedwardauctions.com/.../2012/217.html
I can understand why you're interesting in these types of cards - could be terrific investments in years to come. Good luck getting your hands on them.