Each series (3-4 classes depending on the series) cost $75/ class but you may have as other people as also fit the criteria to take that class,  at your home/site as you wish that night.  It is recommended that each parent/caregiver involved in infant care and parenting to attend the workshop. 

You can find the 16 chapter Manual  from Gottman institute, available <here> for purchase, if you wish.