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.
Stop using Amazon
It’s too convenient. Order something Sunday night, I’ll definitely have it by Tuesday afternoon if not earlier. I always wait until I have enough items I need over $50 before I place an order anyway.