I've looked and don't see any reference to this. I currently have a paid site for a "non-class" group. I would like to establish another site for a school group. The multi-class thing won't work (I don't think) because the groups are unrelated. Is there any multi-site discount or will I need to pay the full fees for both? Thanks.

You can use the "Refer A Friend" to give yourself a bonus $50.00 but that is all that I am aware of for multiple site discounts.

Kyle is correct, there is no additional multi site fee discount other than referring yourself.