divorce mediation costs?

I am supposed to be attending a divorce mediation tomorrow- my lawyer says that there is usually a charge for this that is paid for the mediator (he gave an average of about $75/hr).
Does anyone know if this is true?, because I feel that this lawyer has been bs me the entire time but I already paid him and luckily there isn’t much to fight about with the divorce or I would have found someone else by now.
Thanks
I am in Georgia.
We have already decided that the marriage is over. We were in the middle of the divorce but it has been put on hold because of another court case. But I guess thought this was taking too long and scheduled this so I just need some opinions of whether or not this price estimate is accurate before I get ready to pay someone.

. I can’t tell from the web site below if this is Required or if you have a choice.
"…many Georgia counties now require a "good faith" effort by divorcing couples to come to an agreement through the process of mediation. This does not mean that the couples are forced to agree. They are simply asked to attempt to find their own solution before the case is presented to a judge."
… This site might be useful @ http://www.georgialawoffices.com/family-06.htm ; …
"…many judges enter an order requiring the divorcing couple to attend mediation before starting the long, arduous process of going to trial. " …….
….. So it looks like $75 is likely. This ‘mediator’ will probably try to stretch your meeting for as long as posssible!!