What is the value of a mariano rivera rookie card?

Depends on which rookie. His most popular rookie is tge 1992 Bowman. It typically sells between $50.00 - 75.00 on eBay ungraded in near mint condition. A Beckett graded mint 10 will fetch upwards of $200.00. Expect prices to rise when he announces his retirement and again when he is inducted to the Hall of Fame.