A 1991 Post Mark McGwire card number 2 has a book value of about $1.25 in near/mint -mint condition. Professionally graded cards will sell for more money than a non-graded card in the same condition. Condition is important.
Common flaws with Baseball cards include: rounded edges, creases, off centered, and faded color. Any or all flaws will devalue the card significantly.
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Many of the cards are worth a price close to $3 each. The exact amount will vary depending upon the card's condition.
The 1990 Bo Jackson Post First Collector Series card sells online for $1.99 to $3.00. It is card No. 14 of 30 cards in the set.