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 wish I could do more shopping there, but eBay in Canada is extremely expensive which has lead to it being kind of a ghost town compared to the US. $20-$50 shipping fees, even on tiny items, is common.
So I’ve started to use AliExpress more often. Literally the exact same item on Amazon but without the markup - sometimes even half the price. It’s not a great solution but the online shopping selection here in Canada is awful.