First...Thanks for the question and for using AllExperts.com.
The card that you are asking about is:
1989-90 Hoops #21 Michael Jordan All-Star the Beckett value for this card is .60 cents to $1.50
Always remember if you are looking to sell your cards or if you want to buy cards, these values are just a reference point developed by "average" secondary market sales...if you are a bottom line type of person your card(s) are really worth what you are willing to accept for them or what you are willing to pay.
I hope that this helps a little!!!
Happy collecting,
Craig
PS Please remember to provide a rating feedback for me...thanks.