Thanks for the reply. Unfortunately that won't work in our case. Anybody can purchase at wholesale level.
Our item is normally $39.95 per unit. For 10 or more then the price is $24. There are other tier levels after that.
If a customer uses the coupon code for up to 9 units, then we want to discount each one by $10,making the price per unit $29.95.
What we don't want is for someone to purchase 10 units at the $24 level and then be able to use the coupon code for an additional $10 off. Which makes the price per unit only $14.
Does that make sense?