If you have any in mint condition they are worth a lot depending on the state.. Isabellas home state of Georgia is worth 5 times it's face value now.. MAN.. had a whole role of those fresh from the bank in 1999.. would be worth 50 bucks now..
http://coins.about.com/od/coinvalues/l/bl_state_quarter_values_coins_prices.htm
http://coins.about.com/od/coinvalues/l/bl_state_quarter_values_coins_prices.htm