Giving members who log-in free access to appointments on acuity?

Hi!

I would like to have a member area of the website where they can automatically book some apointments that I have set up in acuity. However, I would like to give the members a discount or coupon that will automatically waive the appointment cost.  I would prefer not having to create duplicate appointments with a fee and non-free version. This is possible right now by offering people memberships through the acuity scheduling subscriptions, BUT I am looking to convert to using the member areas and I would like to give members a perk of not having to pay the appointment cost for some of the appointments.