Ken Griffey Jr. – 1989 Upper Deck Rookie
Across the ‘90s, a lot of people believed that the 1989 rookie card for Ken Griffey Jr. in the Upper Deck would be one of the most expensive baseball cards in history. Even though this did not come true, the card is still one of the most iconic cards in the past 30 years. One with a good grade will fetch you $400.

Ken Griffey Jr. – 1989 Upper Deck Rookie
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Willie Mays – 1952 Topps
Aside from the famous Mantle card, there is another valuable card from the 1952 Topps set. It features none other than New York center fielder and Hall of Famer: Willie Mays. Even though it is not as valuable as that of the Yankees slugger, the Say Hey Kid’s card went for $478,000 during a 2016 auction.

Willie Mays – 1952 Topps