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.
Almost everything on Amazon you can also find on eBay. Sometimes it is a couple of bucks more expensive, but it’s usually due to shit like this. Haven’t bought on Amazon for 4 years now.