I know there is some real appreciaton of the Big O here and there is some nice stuff on eBay at the moment. Khans cards rarely pop up for sale these days and when they do they are usually is less desirable condtion.
Its only his 64 issue but still vintage collectors will clam all over higher graded ones. Big O has two in this set and each as rare as each other but obviously set collectors need the front up pose more. The winning bidder also bought the Hondo RC psa 10 for $15,000US a while ago. He has a great collection and knowledge of vintage.
If a Big O 1960 Khans showed up in the same condition it might fetch $20,000US plus easy. =P~
This one is up to over $500US at the moment.
This one cheper
He also has a psa 8 of the card I posted as a mailday the other week starting at $200US. Mine would be a psa 7 though