I put my 66 set together in 2012...and my one observation, something I have NEVER seen before or since, is there were 3 cards that routinely would have NOT ONE card on Ebay. I checked and searched for most of the high numbers and tracked them for a long span, and these three were extremely frustrating. I ended up getting all three off a retired local dealer who had a busted set and gave me a great deal. They were -
#555 Ron Perranoski
#570 Art Mahaffey
#591 Grant Rookie
Literally, there were days these cards had zero stock on ebay. What other cards can you say have periodic moments like this made by Topps?
As for the Grant Rookie...I am extremely happy I own one...
...but I feel the same way about the other two as well.