The cost of a divorce will, for the large part, depend on how high up the ladder to a trial you go before the case is settled. Attorney s fees will be reduced by you and your spouse directly, and without benefit of lawyers, by settling issues involved in the divorce.
Divorce laws vary from state to state and non of the above books is state specific.
A Guide to Illinois Matrimonial Law, which while written for lawyers and judges, may be of help to non-lawyers. It is available at the McHenry County Government Center law library, Woodstock.