My friend just learned about a Tom Brady rookie card that sold for $400,100:
https://people.com/sports/tom-brady-...tion-reaction/
He became whimsically curious about the possibility of buy 1 of every rookie card in each of the major sports (football, baseball, basketball & hockey) that would have the potential to gain such value should an athlete gain such notoriety. I know he can go to Wal-Mart and buy a box of 100s of mass-produced football cards, but how could he go about systematically acquiring 1 of every special edition rookie card in hopes that one of them might become the next Brady?