How to add extra free product to user order

[mgr_metal]

Hi,

 

I would like to offer free products samples for ordering specific products, or if total order price is greater than for example $100.

 

For example if someone will add to cart product nr 1, the message will appear:

 

"You will also get product nr 2 for free!"

 

I have no idea how to solve this problem.

Is there a way to do it with PrestaShop? Or there is a module that will handle this?

 

Sory for my English.