What is the Collective noun for milk coupons?

There isn't a specific, widely recognized collective noun for milk coupons.

However, you could use a general collective noun like:

* A stack of milk coupons

* A pile of milk coupons

* A book of milk coupons (if they're in a booklet)

* A collection of milk coupons

You could also be more descriptive and use a noun that reflects the purpose of the coupons, like:

* A bounty of milk savings

* A trove of dairy discounts

Ultimately, the best choice depends on the context and the desired tone.