Very disappointing to find out that I have to pay additional monthly price (on top of my monthly Shopify membership) for a quantity discounts app that, like others have stated here, should be considered a basic feature in a e-commerce platform.. a premium at that! We have an Etsy store as well and although they have some limitations, too, setting up quantity discounts as very easy and intuitive - and it doesn't cost you anything - it's a part of the platform.. like it should be.
Too bad I'm discovering all these basic deficiencies after I switched to Shopify!