I have one product in my store. I want to offer a discount if you buy 2, 3, or 4 of this product. Then a general discount over 4 units. Pretty straightforward.
There are plugins that do this, but they are an ongoing expense and more complicated than I need. I also don't want the discount code to be shown at checkout. If possible, would also be good to show the new price in the cart, not in the checkout.