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 don’t know if this will still work, but ages ago, I contacted their support about being one cent under free shipping and they made sure shipping was free for me. Try asking, but I can’t promise the same results.
They’ve passed the point of caring. Originally they would bend over backwards to help you, local(ish) call centers, going out of their way to make you happy.
Now things are much more hit or miss, sometimes you’re just told “tough shit”.