Product Promotion

Hi all,

i want to make a promotion that go with this rule :

1. Customer get this promotion if they buy a certain product that it price is greater or equal than Z

2. This promotion will make customer able to buy a product with fixed price

3. If they buy 1 product that full fill condition 1, they only able to get 1 promotion, so if they buy X product(s) they only get X promotion(s)

For condition 1 and 2, i already able to create it, but how to make condition 3?

because as long as i know, if we give this promotion to a customer, they can buy more than promotions that they have ( Ex: they buy 1 product that full fill condition 1 and they buy 2 or more product from condition 2)

Thanks