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 been going to ebay more recently. What I do is try to decipher the Amazon reviews and then go to ebay, even though I have Prime. My headlamp led was less expensive on ebay by 50%!