Card show fills Fiserv Forum atrium, post-trade Giannis card values discussed

MILWAUKEE (CBS 58) -- The Wisconsin Card Show by Lake Country Cards filled the atrium at Fiserv Forum on Saturday, June 27, marking the show's first time at the venue.

The event featured sports cards, trading cards and memorabilia. With Giannis Antetokounmpo's recent trade to Miami, organizers answered questions about the value of his cards.

"If you look at some of his early rookies, four figures. You get into some of the rare, numbered ones, you're easily getting into five figures. There's some as high as into the six figures," said Adam Campbell, consignment director at Heritage Auctions.

"The most expensive Giannis card ever, I think it sold for... it was in the millions, and that was a few years back."

Card values vary significantly based on grade, with the difference between an 8 and a perfect 10 considered substantial.