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 still sometimes find cheap things that are reasonably priced. These keystone wall plates for Ethernet/HDMI/etc are 99 cents for example: https://a.co/d/hAYsejh