Coupon only posting to my account for $29.99 On the phone with them now.
So officially the promotional value is not eligible for sale/clearance items. But the nice gentleman was able to apply a credit to my account for the balance.
Now the original coupon isn't working. We'll see what else they can do for me here.
Edit-
Just finished checking out, they ended up cancelling my coupon code and just putting the full $50 as a credit on my account. Since half of my cart was clearance items (which should've been inelligeble) they wouldn't give me any additional discounts for "my trouble".