Discount offer after user adds a Product to the cart.

I’ve seen this feature in a web site but forgot which one. If anybody knows a website that has it, please let me know, I’m trying to see what’s the best flow to code it for CS-Cart.

Here is how it works:

When user adds Product X to the cart, he is notified that the cart content qualifies him for extra discounts on RELATED products. When user clicks Checkout, he has Product X in the cart and the related discount offers on the same page.

I checked on Amazon, they don’t have this same flow, they work with Discount on Product bundles from the Product Page, nothing that is triggered after the user adds a product to the cart.

Please let me know if you’ve seen this somewhere…