They are not worth what you payed for them and probably never will be. When you factor in the price of the book and all the extras to collect the State Quarters, you won't be making a lot of money on the set. I know people that paid $30 for each coin release, with certificates of uncirculated documentation and one sheet page of info on each State. Because so many people collected them, the monetary value of each set, becomes nil. The value, as a keepsake, is what you put on it. The Educational value is the highest as it helped, in a small way, of getting people interested in all of the States. A great learning tool for many. Save your set for your children and their children to use over the years, or spend the quarters as quarters, your choice.
If your book contains quarters from every state plus the District of Columbia and Puerto Rico; and if it contains full sets from both the Philadelphia and Denver mints; and if each coin is in good condition, then it would be worth $26.