Discount Coupon - Product and Quantity based

Using the latest version of Zen Cart...

We would like to have a coupon that is restricted to a specific to product (easy to do) but also restricted to only if they buy over a certain quantity (say 250)... Any way for this to happen? I've looked all over the forms and couldnt find anything about it.

All of our products have quantity based discounts already, we just need to offer the customer another 5% discount for example (via coupon) if they buy over 250 quantity.

Thanks for any help.

Discount Coupons do not have Quantity restrictions ...

If it were for 1 Product, then you could use the minimum Price restriction with the Product Price x 250 ...

Otherwise, you would have to do a lot of customization to manage a coupon based on quantity ...