I am planning to do a special offer for Black Friday and Christimas.
If you order 5 products you pay only 4.
So I want for example in the shopping cart when you have in the cart 5 products, the cheapest one to be zero.
Product 1 - 10$
Product 2 - 9$
Product 3 - 8$
Product 4 - 9$
Product 5 - 7$ (not calculated)
Total to pay: 36$
Is there a tool to do this?