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.
All companies have to earn a profit, not just to pay for the expense of the goods plus all of the overhead, but also to be able to reinvest and grow. There’s a difference between earning a livable wage while the company as a whole remains poor and earning barely enough to live on while the investors pull in massive gains year over year.