Cost depends on how long the process takes. If you are mediating, you may try to do as much of the work between the two of you as possible. You may choose to pay as you go. Most divorce mediation couples share the cost. You decide the frequency of your meetings.
Collaborative representation requires a retainer agreement.
The amount of the initial retainer varies and will be determined upon an initial consultation. Divorce coaching is available on an hourly basis but also requires a written fee agreement. There is no initial retainer necessary. Other professionals may be involved in the divorce process. In mediation, for example, a trusted child psychologist may provide input.