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.
Just by something costing .01
Like what?
Half cent piece
Digital items, but Amazon intentionally makes them impossible to find. There’s a ton of e-books and Audiobooks that are $0.01 - $0.05, but Amazon intentionally buries them under the “free with Kindle subscription” crap, so that people can’t milk this without really putting in the effort