Amazon gives non-Prime members free shipping at $35 or more of eligible items. Instead of simply letting users get the product with free shipping, they’ve added a discount that prices it exactly one cent below the $35 limit, while only subsidizing the price with $3.38, which is about half of what they’ll then charge you for shipping.
I do this. But, I’m also lucky to live in a city with second hand shit everywhere. Not everyone lives in a city.
But, google shopping will tell you an alternative store to buy most things online. And compare costs for you. This gets tricky if you’re also trying to cut google out of your life though. There really is no ethical consumption under capitalism ¯\_(ツ)_/¯